I have a cellular watch 5 and 7.1 bricked it under ios14.2!
I had to have the watch replaced it kept rebooting no matter what we did and it was so bad it was non-functional. I’ve got the replacement one now and it’s got 6.2.8 and I’m not even trying it until 7.2 comes out!
I suspect but can’t prove it had something to do with watch faces and complications, because I use infograph with better day, compass, weather and rain, ecg, stock, messages, and voice record. It’s a lot but it’s why I bought the watch! Having said that, it’s been rock stable until 7.1 unstable edition came along! WTF Apple! You need to reboot the company!