As you apparently already know WINE/Proton is just for games that are not available in native Linux versions.

My own Steam library is packed with games (thousands of them with many thousands more available for purchase at any given time), and very few of those require the use of Proton, but it sure is nice to have available, since it adds the ability to play games which would otherwise bit-rot there in my library.

Windows and game consoles raise a couple of thousands more and pay to see the cards, if we are playing quantities game.

If on the other hand we are playing the quality card, or what everyone else is actually paying for, then down Proton it goes.

Isn't ironic that while most Android games are NDK based, so basically ISO C, ISO C++, OpenGL, OpenSL, Vulkan, they don't get ported to GNU/Linux?

Or Stadia ones for that matter (regardless of its possible future).

All fair points, but honestly? I fully expect comparability layers to be at least somewhat flawed and I adjust the way I do things accordingly. Game doesn't work 100%? Whatever, I have other games to play.

At the end of the day, I don't want to reboot just to play a game. I personally don't see the need to be a comparability purist here.