Linux, since the inception of Proton is a viable place for gaming. Go ahead and try it out, I promise you will be pleasantly surprised ;)
Even games that have reasonable performance on Linux may require custom builds of Proton, winetrick startup modifications, etc. I love Proton and the work Valve has been doing, but I certainly feel the friction when gaming on Linux still.
New issues always crop up whenever there's a new AAA title with the latest tech. It's inevitable.
All in all, I stand by what I said in that Proton is great, but expectations should be tempered since it definitely has some rough edges still.
That's it.