You can do similar with some games on Mac but it’s done through the windows client which is what I assume is being measured - couple that with the comparative difficulty of setting wine+steam up and you have negligible mac usage.
Which difficulties are involved in selecting a Proton version from a dropdown and clicking install?
I only boot windows to play VR. Gaming on linux is easy* compared to the early days. Nobody messes around manually with wine instances anymore, dude; wine/protontricks is a thing. (98% of the time at least).
[*] Easy for the games that run on Proton, which according to ProtonDB is ~70% of the titles on steam (those with silver+ rating).
Edit: I should mention, I swore off AAA gaming years ago, so that likely contributes to my satisfaction with linux gaming. Really, though, nothing of value was lost to me.