I think this is a sign of Apple's desire to transform into a services company--App Store, ApplePay, Apple Music, AppleCare, iCloud, etc.--for which their hardware is merely a gateway into their paid services. Historically, Apple has been viewed as a hardware company and consequently evaluated in large part on its marketshare (based on units sold). This move helps Apple deemphasize marketshare and focus purely on revenue and profits.
However, this strategy is very risky. Services depend on hardware and Apple appears to be preparing to place all of its eggs in one (ARM-based) basket.
Personally, I continue to think Apple is going to merge its hardware and software platform around its ARM-based CPUs because the largest market which offers continuing revenue is phones (replaced every three years as opposed to every five years for computers), which Apple now views as the primary gateway into its ecosystem. Establishing an entire ecosystem on its phone hardware (i.e. ARM) is the most certain way to guarantee continuing revenue through hardware and more importantly software sales.
This does not mean that macOS and iOS will be the same OS or even have the same interface, but rather that both will become based on the ARM architecture. Apple will continue to reduce the differences between the OSes until software that runs on one set of devices runs on all devices (though probably with certain caveats, e.g. split screen may be limited to iPads and Macs while being unavailable on iPhones due to screen space and resolution).
The danger for Apple is two-fold: first, Apple's high hardware prices could reduce its marketshare to the point that it negatively affects their revenue from services and second, Apple's shift to ARM may lead to a mass exodus from its Mac platform, especially if Windows continues to use x86-64 CPUs. We shall see if Apple will be able to maintain its higher ASPs and if Apple will be able to retain its base of Mac user during its upcoming architecture transition without losing so much marketshare that it damages its services revenue.
In sum, Apple is moving to become a company primarily for the masses. Professionals and users with specialized needs (e.g. A/V professionals, engineers, those wanting home servers, etc.) will need to find solutions elsewhere (Windows, Linux, pre-packaged NAS solutions, etc.).