Agree. The narrative got out there just before iOS 12 launched that many features would be deferred to iOS 13 which would be a big update. I think that morphed to an iOS 7-like large visual refresh.
In my mind, iOS 13 is, in many respects, more groundbreaking than iOS 7 was. iOS 7 reflected the maturation of design and “growing up” of iOS and, more importantly, the user base. Users no longer needed to be presented with skeuomorphic/lifelike representations of electronic tools in order to recognize their parallels to their physical equivalents.
Think of it as the equivalent of moving from pre-school/primary school to middle school / high school. In the former, students learn the use of tools (the alphabet, numbers, etc...). In the latter they learn how to apply the tools. With skeuomorphism, smartphone users learned how to equate electronic GUI elements with their functional physical equivalent. In the post-skeumorphic era, they no longer needed the training wheels and could recognize the electronic tools in their own right.
Now, we have reached the digital equivalent of college, where tools are no longer there to be learned or applied in a rudimentary way. Now, for those who care to use them, the tools are there to actually create new experiences. Shortcuts, for example. The exterior changes are much more subtle to the outside viewer (much like a high schooler moving on to college doesn’t appear to change much physically) but the interior changes are profound. iPadOS, in particular, reflects this, with its new emphasis on content-creation rather than simply consumption.
To leave the education analogy, the more subtle but substantial changes in iOS 13 also reflects the maturation of smart devices overall and the place of the players in that market.
The innovation curve has flattened nearly asymptotically simply because that’s how development of any technology proceeds. Books (yes, a form of technology) have not changed much since Gutenberg because they met the needs of the user and there were not many fundamental outward changes that could improve upon them. Similarly here: the low hanging fruit was gathered in the heady era of 2007 to, say, 2011 or so. After that, the pace of change has been much more measured, more in the nature of tweaks than radical change. Even Dark Mode is just window-dressing, although a highly desired change.
Bottom line (for those who’ve bothered to read this far!) is that the technology has matured and we’re just not going to see huge visual changes going forward. Apple has chosen to take a conservative path here (and its hard to argue with their choices given where it has propelled them - from a failing boutique personal computer maker to the most dominant business enterprise in the world) and Google has chosen a more open, adaptable yet hard to adopt environment. It is hard to argue with their choices, as well, given the numerical preponderance of their users. Each presents its own advantages to its user base and each caters to the average user mindset in that user base.
At the end of the day: pick Apple if you want consistency and predictability. Pick Android if you want more customizability.