Fully resetting the watch is a sorry thing that I too have to deal with. Despite Wear OS 4 (on GW 6) having backups and switching functionality, half of the time it doesn't work. I don't have a rooted phone, but switching phones or God forbid, you forcibly remove Galaxy Watch from Bluetooth settings and then you have to redo things from scratch sometimes.
Too bad, that some Garmin models support Gadgetbridge, but I don't think any Wear OS model does.
Aww, if they really put half as much effort into the Pixel Watch as they do on it's marketing, the former would come in repairable form factor by now.