Thanks, I did last month (same 60.x thread btw) when I encountered a weird issue with the button but I believe that wasn’t right after an update. All devices right now are working fine so there’s nothing to see in the account.
The factory reset has not been needed for recent firmware updates, they just take 10-15 extra minutes to come back and work again.
They are stable as long as the environment also stays stable. The days I needed a factory reset were coincidentally the days I was testing multi-admin scenarios or using more Thread border routers in the same network. Now I don’t use multi-admin and everything seems much better.