Comment by dghlsakjg
The exact same underlying software (Wine) that lets you run all of your windows games on Linux using Proton also works on MacOS using Crossover.
I haven't found anything in my steam library that Crossover (wine with a nice GUI) hasn't handled on my Mac yet. I'm sure a bad game exists, but for most games it is seamless.
I tend not to have unrealistic expectations like running AAA titles at high framerates on a mid-tier laptop, and tend to go for indy games, but the games I have run work great.
Native game selection is - in fact - pretty limited, but who cares if it is being run with a compatibility layer if it plays well.
Interesting. I would imagine the experience would be pretty poor (compared to Linux), and that the state of Direct3D/OpenGL/Vulkan to Metal translation to not be very mature or performant.