Ben, I agree wholeheartedly with your point about the Watch and its extraordinary capabilities. It's so much more than a watch!
But I will nitpick this bit of hyperbole.
Those old enough to remember the original iPhone will realize that it was a revolutionary smartphone in terms of what you could do with it, and also that today’s watch can do all those same things, and more … and do it all easier and better with a superior UI.
Not sure that's true, at all!
A disclaimer at the outset. My comparison point is an iPhone 4 — one I still use!
But we're now up to generation 8 or 9* of the Watch and it still can't do things the iPhone 4 can… or, in many cases, what the original iPhone could!
* See
https://www.imore.com/health-fitness/apple-watch/history-of-apple-watch
Here's a baker's dozen of things that come to mind!
1. Can you surf the Internet on the Apple Watch in the way you can on the iPhone 4? (Or, on the original iPhone for those who know it?)
2. Can you play games on the watch as you can on the iPhone 4? Bonza, Risk, Scrabble, Sudoku, Solitaire, etc.? Especially viably?
3. Can you play
music directly from the watch
without ear buds?
4. Can you run full-fledged planetarium programs? And use them at the telescope? Or, to show the path of the ISS through the constellations?
5. Can you read ebooks comfortably? Are there even multiple ebook reading apps for the Watch, especially ones comparable to Stanza, Shubook, or eReader?
6. Can you type emails on the Watch as easily as you can on the IP4? (Or, the original, for those who have or had one?)
7. Can you take photographs with the Watch?
8. Can you read
full articles from major newspapers?
9. Do you have full-fledged, unabridged, searchable dictionaries with thesaurus and etymologies on the Watch? Is the classic Webster's 1913 Unabridged Dictionary available for the Apple Watch? Would you even want to use it there?
10. Can you download and view the latest images from SoHO, Hubble, or Spitzer? And be satisfied with what you're looking at?
11. Can you run spreadsheets and databases on the Watch? Not to mention, reasonably and productively?
12. Can you group apps into folders? Do you have ready access to 20 apps on one screen? As opposed to 5 complications max, at least up through Series 7.
13. Can you do any of the above things easier and better on the Watch?
For sure, the Watch does things the original iPhone and IP4 never could — and that even current iPhones can't. You've described those well. It's a viable, satisfying device in its own right.
But the Watch still can't do many things that the early generations of the iPhone could! Yes, that’s because it is severely limited by its tiny screen, and its position on one's wrist. But that simply reinforces the point that it still can't, after 8-9 generations, do what the early iPhones could — and can! However, to reinforce your argument, that's not its purpose!
Finally, the Apple Watch GUI remains incredibly primitive and limited in many respects compared to that of even the early iPhones. But that’s a discussion for another time.
In short, the Apple Watch is, as you point out, definitely far more than a watch, but it's no iPhone! Just as the iPhone is no tablet!