Linux becoming better than Windows to run games is the sort of thing that should actually scare Microsoft because it can lead to non-engineers installing linux because game go fast. The people spending a grand on gpus will put up with real hassles to that end.

Why would Microsoft be scared? They still own and set the future direction for the Windows APIs that those games are designed for, meaning that they're still in the driver's seat. Proton has to play an eternal game of catch up.