I bought a sony smartwatch 2 when my conventional watch died.
Most of the uses are completely, well, "meh" - telling the time, message notifications, having a wrist calculator, fintness apps, remote camera button. Yeah, I use them, there are fringe cases when they're useful, no, they aren't worth buying a smartwatch for. I can live with charging it once or twice a week.
There is only one thing that made it worth the £50 I paid and that's the "Find my phone" button. Means I can track the blighter down!
Squirreling it's way down the couch or hiding under cushions no longer works for the devious little smartmobe anymore, I no longer have to search 12 pockets to find which one it's in, and the watch even vibrates when it's lost connection so I know when it's tried to stay in my car without me.