Why do people spend money (and quite a lot of it) for devices that have less functionality than a smartphone?
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Tablet is just a bigger screen, but not same power like a laptop.
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Smartwatch is just tracking device that sends even more of your personal data.
And BOTH are another battery that you have to worry about.
The big tl;dr is that a lot of stuff will work, but a lot of things relying on historical data will not work (resting heart rate, weekly step count, sleep, etc).
But, the app/account is unobtrusive to the point that you could name yourself Mickey Mouse on creation, just to get a user ID for the watch to point to, and set permissions on the app on some schedule just to have the watch sync that data.
No sort of verification/authentication of identity at account creation and the app/services are free (I’m sure, given this day and age, there’s premium/subscription stuff but like I said it’s unobtrusive and I’ve never once been nagged to upgrade my account)