> don't forget that the drivers for GPUs would until recently get updates to patch specific video games for performance issues (not sure if they still do that ?)

I bet it's all the same if not worse, and that's why GPU drivers are closing in on the gigabyte "sound barrier" (and I guess on Linux that part is played by Proton... e.g. I bet there's a ton of game-specific 'workarounds' in Proton, if not for performance, then at least to fix 3D API misuse).