Linux is all good if you only play singleplayer games. My friends started playing the finals yesterday and it doesn’t run on linux because of EAC. Windows can run all my games without any proton switching and all the nvidia features like ray reconstruction and pathtracing with frame generation just works (alan wake 2 looks so good).
I’m sure Steam knows what client it uses. Which means there could be. And having a build that works with a defined version of Wine or Proton would be such a build
That would be a stupid approach though, Proton gets improvements and bug fixes all the time. They’d be missing out if they locked their game to one particular version. As long as they did the bare minimum & aren’t actively hampering support on purpose like Epic Games does, then the game will work and any bugs will be patched by Valve and the community.
Yes, it would be stupid approach. But that is the minimal viable approach to having a “Wine/Proton build”