Maybe it sounds overdramatic but if the point of a computer is to play games (and I did spend a lot of money for it) and it stutters consistently to the point that the “80” FPS I’m getting looks worse than a consistent 30, then yeah, I’m going to do something about it. And since the simplest way was wiping the system and reinstalling, then going for linux at least at first makes sense.
My steam install isn’t with flatpack, I just did an apt install to get it. My Dualshock 4 worked in Elden ring without any changes from my side.
Is it every game? Or only specific ones? Is your controller bluetooth or does it have a specific dongle?