I was rotating an s4 and an s7 until last year when I gave my s4 to my son and upgraded to an aluminum s8 for sleeping and evening workouts. It has worked well for me.

I don’t miss anything. My Apple Watches have been much better all around.

I don’t know but I have a short cut to turn it off while at work and turn it back on when I leave. I keep always on display on so that works for me.