Any Google smartwatch. I bought 2 at one point. A sport and a dress watch. Both only lasted about a year before the software rendered them useless.
I’m now back on analogue watches.
Your experience is so common that I don't understand why manufacturers keep doing it. Sure I get people want updates, but major UI changes should be optional.
It's almost aggressive how quickly smart devices get shuttered, being an oldschool techhead I've always dreamed of being a walking compute center, but just like smart house gear, you can't expect a thing you buy today to work next week and we are just conditioned to accept it.
I have a pixel watch I bought around its launch (IIRC) and it's still going fine today. The only issue I've had is, since starting farming, the little dial can gum up a bit, but it can be cleaned.