so you do know that even if your device (watch, iPhone, Mac etc) does not receive OS updates anymore it still continues to function, right? and usually you see security updates for several year.I'm currently using se 1, I wanted to upgrade to Se 3 or series 10 last year but it wasn't a revolution and there was no SE 3... Now I just want a new watch with LONG watchOS support and no need to buy a new one in few years...
IF longest OS support is your main criteria you should always buy the latest tech, not devices that have been on the market of 1+ years.