Accordingly, Cook should be judged on his ability to build the sandcastle over the years. Since he became CEO in 2011:

The iPhone installed base has grown by 500M users.

The iPad installed base has grown by 175M users.

The Mac installed base has grown by 50M users.

Apple introduced Apple Watch, the company's first wearable product. Approximately 18M Apple Watches, a device positioned as an iPhone accessory, have been sold to date.

Apple is earning more than $6B per year of revenue through app sales via the App Store.

Apple successfully made the difficult jump from a paid music download model to streaming and is approaching 20M paying Apple Music subscribers.

Apple continues to push forward with Apple TV. The company is approaching 10M units sold since the device was updated in 2015.

Apple continues to develop key services including Apple Pay, Messages, and Maps.

(The math behind these figures and estimates are available for Above Avalon members. You can become a member here.)

It quickly becomes clear that Cook has built a spectacular sandcastle. Apple has never had a stronger ecosystem. There are now more than one billion Apple devices in use and 800 million people own at least one Apple product. More remarkably, the average Apple user owns more than one Apple product. This is even more astounding when considering the competitive landscape.

iPhone Focus

Apple is making a very bold statement that it is still time to double down on the iPhone. It would be an understatement to say that Apple stands out from its largest peers with that thinking. Look at some of the leading tech companies' primary advertising campaigns:

Apple: a smartphone (iPhone).

Amazon: a voice assistant (Echo).

Google: a voice assistant (Google Home).

Microsoft: a touch-based laptop/tablet (Surface).

The companies lacking a smartphone offering are increasingly trying to get consumers to move on to the "next big thing." Amazon is pushing the idea of using a voice assistant and series of speakers to replace your smartphone. Google is doing the same with Google Home. (Pixel is actually a Google services play.) Microsoft is focused on trying to carve some kind of niche for itself by focusing on touch-based PCs. We can even add Snap to the mix and position Spectacles as early motivation for wanting to impact smartphone usage.

Meanwhile, Apple is placing a big bet that we are still firmly in the smartphone era. In Apple's view, many of these competing products are distractions trying to get us to move prematurely beyond the smartphone. This stance has contributed to the view that Apple is missing a step and resting on its laurels. While Microsoft pushes Surface Book and Surface Studio and Snap unveils sunglasses with a camera, Apple is still betting on a smartphone, a product unveiled in 2007.

Cracks at the Edges

This pursuit of milking the iPhone has contributed to cracks forming at Apple's edges. The friction is found when looking at Apple's efforts to build a wider ecosystem that extends beyond the iPhone. There is evidence that Apple management wants to follow a product strategy described in my "Apple Experience Era" article. Consumers can pick and choose a range of Apple products that best fit their lifestyles. This is why Apple is very vocal about continuing to invest in the Mac. In addition, Cook has reiterated his view that the iPad is the clearest expression of Apple's vision of the future of personal computing.

However, Apple's handling of the Mac line has been increasingly questionable. The same can be said of the iPad line. It will have taken Apple at least two years to unveil a line of "Pro" iPad models spanning from 7.9-inch screens to the 12.9-inch model.

While some have been quick to throw Apple's functional organizational structure under the bus for causing these cracks, the organizational structure is not to blame. The issue doesn't relate to a lack of focus either. Apple still isn't selling that many products. Instead, these cracks are a result of today's changing tech environment.

When looking at some of the key accomplishments during the Tim Cook era, the installed base growth figures for Apple's top products stand out. For every 100 users by which the iPhone installed base increases, the iPad installed base will grow by 35 users, and the Mac will increase by 10 users.

A vast majority of these new iPhone users will never own a Mac. As iPhones have become larger, odds have increased that these iPhone users may never own an iPad either. The iPhone has gained so much power in recent years that the iPad and Mac's long-term sales trajectory have faded. I suspect this reality explains why iPad updates are less frequent these days. The same can be said of the Mac. More frequent updates for iPad or Mac likely wouldn't increase sales.

Many have been quick to label the new MacBook Pro as flawed and not truly a "Pro" computer. In reality, Apple is focused more on redefining Pro's definition in addition to expanding the MacBook Pro's mass market appeal. This is why Apple is focused on bringing aspects of the iPhone to the Mac (multi-touch screen positioned above the keyboard, Touch ID).

Risks

Apple faces a major risk in relying so much on the iPhone to build its ecosystem. While this may be heresy in Silicon Valley, ecosystems are not everything. There has never been an ecosystem strong enough to stand the test of time. The App Store is not invincible. At a certain point, Apple will need to be willing to put its iPhone ecosystem at risk.

There are many signs that Apple management is keenly aware of this since Apple has had to risk its ecosystem multiple times over the past two decades. During the late 1990s and early 2000s, Apple spent years rebuilding the Mac ecosystem. Recall Apple's "Mac as the hub of your digital life" product strategy. The iPod was merely a Mac accessory at launch. However, Apple's decision to eventually bring iTunes to Windows changed the game. The move threatened the very same Mac ecosystem Apple had spent years building. Users would no longer need a Mac to use an iPod. Apple was willing to risk its current ecosystem in order to catch the next technology wave.

However, instead of doom, the iPod became a household name and played a role in helping the iPhone get off the ground. Meanwhile, the Mac was no longer going to be the center of Apple, and more importantly, our lives.

This raises an interesting question. Is it possible that Apple management is okay with the cracks that are forming at the edges? While the new MacBook Pro may infuriate loyal Mac users, a strong case can be made that management truly thinks such a product is the right one to ship in today's environment. To see why, notice how Apple is milking the iPhone: having the product appeal to a wider user base. Instead of chasing profits, Apple is following the same strategy with the new MacBook Pro. Apple has no interest in repeating mistakes from the early 1990s and selling product to the smallest of niches.

Chasing Waves

Apple is confident we are still in the era where it makes sense to milk the iPhone. Consumers are giving even more tasks to their smartphones. This may continue for another two years, or maybe even five years. While Apple may be building a sandcastle around the iPhone today, the company will need to find the next big wave that may topple that very same sandcastle. The company is looking at two industries to pivot into:

Wearables . We are talking devices for the wrist (Apple Watch), ear (AirPods), body (clothing), and possibly even eyes. Apple's growing investment in health is a big clue as to Apple's intentions in this area.

. We are talking devices for the wrist (Apple Watch), ear (AirPods), body (clothing), and possibly even eyes. Apple's growing investment in health is a big clue as to Apple's intentions in this area. Transportation. Apple would develop an array of personal transportation options in various geographies. With ridesharing and autonomous driving, someone will be in a position to rethink the car within the next 10 years. Apple has many of the ingredients in place to be that company.

Neither industry is niche. Health is something that will appeal to pretty much every human. Wearables have the potential to have adoption curves similar to smartphones. Similarly, nearly every human has some need for moving form Point A to Point B. More importantly, transportation is the gateway to the grand prize: housing. When contemplating a smart home, there is nowhere better to start than developing smart rooms on wheels.

In both cases, the ecosystem that Apple has spent the past nine years building with the iPhone will provide the company a head start. It is much easier selling Apple Watches into an ecosystem of 800 million users familiar with Apple products. However, Apple will need to eventually take a leap without knowing exactly where it will land.

One question facing Apple today is whether opportunities are being passed over because of its iPhone dependency. A convincing argument can be made that Apple's early missteps with Apple Watch were due to the company looking at the device too much through an iPhone lens. What if Apple approached the Apple Watch as something other than an iPhone accessory?

A Fundamental Theory

This brings us to one of my fundamental theories regarding Apple. For Apple to remain relevant in the future, the company will need to attack itself. Management will need to risk its own ecosystem.

When it comes to catching the next big wave, an Apple Watch with cellular connectivity may end up representing the single biggest game-changing device Apple has shipped since the original iPhone. It would be that big of a deal. The reason such a product contains so much risk for Apple is that it threatens the iPhone. Why buy a brand new iPhone every year when your Apple Watch (with AirPods) are handling tasks that you used to give your iPhone? In addition, a cellular Apple Watch will more than double the device's addressable market to include all Android users.

There is a possibility that Android users may embrace Apple Watch without buying an iPhone, iPad, or other Apple product. Apple would seemingly be giving away the keys to its iPhone sandcastle. However, instead of causing panic within Apple HQ, this would be done by design. Apple would be willing to risk its ecosystem in order to build a new ecosystem around wearables.

Apple shouldn't get rid of its functional organizational structure. In addition, there is no evidence of Apple needing a management reshuffle. While there is clearly room for improvement in many parts of Apple's business, management's actions are very rational. Apple is taking lessons learned from the 1990s and using them to not repeat the same mistakes with the iPhone. Milk the iPhone today, and then figure out what comes next.

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