Kinda funny I use and have have used Nvidia + X11 from 2003-today with recent drivers and kernel but not the absolute latest that came out 10 seconds ago.

I never worry about whether it's an issue with Wayland, Gamescope, or xWayland because I don't use any of the above, I don't worry about FEX because I'm not on something exotic and ARM just plain x86-64. I don't worry about MESA. I also don't worry about Nvidia drivers as they are completely separate from the kernel and virtually never problematic.

If I had a problem with a game I would just start the game from a terminal window and google the error messages to discover what they are liable to mean. If I ever did encounter a problem with a new version I would just install the old version and try the new version again next month. This would take 2 minutes and a reboot.

I find behavior on Linux extremely predictable, observable, and deterministic. I can literally at any time roll back my OS to day or update by rebooting into that version of the OS without messing with my user files. Furthermore one doesn't normally find bugs that effect just you I can virtually always find out what component or app is misbehaving and track an issue related to that misbehavior or at worst create such an issue myself and watch the progress.