> because it's exactly what I'd want.
I’m not sure it is.
Most of the things you list aren’t that functional on Watch, in my experience. It’s ok-ish to pull up on Watch after you’ve set it up on your phone, but without a phone, Watch is much more limited, IME.
You can definitely use Watch for a number of things without an iPhone — Weather is one you list that is mostly functional, Timer, and Calculator.
But beyond these basic by-design limited functionality apps, Watch doesn’t do a great job as the main driver of most apps — just more as a companion to the iPhone apps.