Yeah it has been for a while. The steam deck runs Linux out of the box.
Valve and open source devs have put a lot of effort over the years on projects like Photon which is a translation layer for Windows games.
Proton, not Photon. ;-) Here is a list with games and their support status: https://www.protondb.com/
The question was "better on Linux on a Mac", meaning specifically Asahi Linux.
The correct answer is no, not yet anyway.
Linux running on x86 with proton is still the bee's knees for most games though.