Not really a good comparison. The original telephone was a fixed device. A better comparison was to the later cordless phones...which had to be recharged. I actually owned a Microsoft cordless phone for some years.
The original cell phones looked like walkie talkies (brick like devices), which had to be recharged. As tech advanced, those evolved into smaller flip phones (mine was a Motorolo), and later still into smartphone devices like the iPhone. All has to be recharged. I actually tried to trademark the term "Smartphone" in the early 90s (for a non mobile product). The letter I got back from the US Trademark Office said Microsoft already owned the term.
I bought the watch when it came out and one for my wife some months later. Both are worn daily and both have only the original band, with no interest in a new band. I have yet to encounter anyone else, anywhere, wearing an Apple Watch. I know lots of folks with fitness bands, including a few relatives. Virtually everyone I know has an iPhone.
I've always been more of a function over form person, but that's just me. Most are probably more form based. I would welcome a thicker iPhone for more battery life. The most useful accessories I have purchased in the last year or so is a wireless chargeable case for the iPhone and an assortment of QI chargers including a car mounted one. They were very low cost, easy to use, and ended, literately overnight, my issues with battery life.
The future for AW is still a story not complete. We love ours, but it appears the public has a slightly different view based on the lack of seeing them anywhere. Maybe I'm just not in the right places, but that's our experience to date. My gym gear came from Amazon and is at home.
The AW OS has improved greatly and the user experience improved as a result. It's been a good combo of form and function and battery use has improved (at first when the AW hit the charger at night it was close to out, now it tends to be 30-40% left.)
The band/sensor story is interesting. Time, and consumer direction, will tell where it all goes.
I never understand anecdotes like "I never see an Apple Watch anywhere" when I see them daily. Maybe it's your area? My banker has one. People that work at my dealership wear them daily. I see them every morning when I go to the gym. Even at the store. So it's not even a once in awhile thing. It's daily. So for you to not see a single one? I don't know. Seems odd to me.
I love mine, but it is definitely flawed. Haven't been very interested in 3rd party apps aside from my bank's glance since the watch launched. They definitely launched it before it was ready. The fact that it's as laggy as it is is just...not apple like. I never say "Steve jobs would have never" but....
Hopefully watch os 3 really improves things next month