No not that[1] Proton.
I've long felt that gaming's "home OS" should be Linux (or at least an open-source OS... in my case, big fan of NixOS, even with its new-user warts). Especially when you look at the long term (running older games to show your kids, etc). I'm glad Gabe felt this way too (for a long time now, it seems). Microsoft is too capricious an overlord for what is essentially almost all of gaming, I think.
Now if only there was something like proton for macOS that enabled windows API gaming on M1/2/3/4 Macs... (I know Apple has some sort of half-baked-seeming "game porting toolkit" that I believe might make use of it, but just something native to Steam on Mac would be sweeeeet)
Everyone stands on the shoulders of giants.