same here i have a MacBook Pro 13-inch 2019 model, Aldo It has a keyboard problem, I still use it for daily usage, but im also having the problem of screen flickering as of now, It affects the lower part of my screen I tried everything to fix it, but my last solution is to downgrade back to Catalina. I hope apple can see this and consider fixing the problem for all MacBook, or Mac users that are effected.
I never head a problem with macOS Catalina but macOS Big Sur seemed promising until now, please apple fix this problem...
and i also figure out that some big Sur beta users experience this problem before the official release, so i considers this problem a software problem.