Which is even funnier because a lot of the times the native builds run worse, if at all, and it is typically recommended to just use Proton. Native clients unfortunately mean jack shit if they aren't properly supported and maintained by the developers, which is why I'm not too fazed whenever people were warning that Proton will cause fewer native titles. Like, have you seen the Linux gaming market pre Proton? It was not pretty, not even with Wine, but especially with just native titles only. Can't tell me they would rather go back to that instead of the current situation.

Yeah, makes sense. However, that could be easily solved with a popup or something when you first launch a game that says, "This title has not been verified by Valve to run properly on your platform, do you want to continue? [ x ] Don't show this again."

You can buy games for any platform regardless of your Steam Play settings. They just might not show up in your library.