As someone who has about 800 Steam games (mostly various indie titles, some free games, few AAA games grabbed on a discount:
* all 800 of those work on Windows, in very few cases any of those work better on another platform
* about 600 of those can be made to run on Linux distros with Proton (with varying degrees of success, relatively few actually have native versions)
* when it comes to Mac, only about 120 of those have native versions that run and Proton doesn't seem to be an option
* I know that Game Porting Toolkit exists, but haven't really looked that much into it, I probably should in the future
* none of that, not even Proton would be really necessary, if people bothered to export versions of their games for all platforms, which is at the very least an option that is offered by all big mainstream game engines, or even smaller ones like Godot; but we don't live in that kind of a world, sadly
* oddly enough, in many cases games won't run because the developers explicitly choose not to support additional platforms, especially in the case of the various anti-cheat solutions, which plain sucks
It's quite unfortunate, because otherwise I could definitely enjoy more gaming even on my slightly dated M1 MacBook Air - because while I wouldn't be playing that many cutting edge AAA games, if you could have a satisfying gaming experience even on a Nintendo Switch, then I see no reason why the same couldn't be said about Apple hardware.
