It isn't just kernel level anti-chat, while yes that is an easy thing to point the finger at and valid. It is also just the chance of a game making some random

It isn't just kernel level anti-chat, while yes that is an easy thing to point the finger at and valid. It is also just the chance of a game making some random change that has nothing to do with Anti cheat and that breaking the proton compatibility, this happened with Halo Infinite and others. The ease of proton also goes out the window once you leave Steam and SteamOS. There are various things out there but if you own games on other platforms it does take more work which is a barrier for non technical people. Don't get me wrong, Proton is a great piece of technology. But it is still a compatibility layer that will never be perfect. A layer that I don't have to even think about on Windows, everything just works. It is all tradeoffs.