I hope they don’t ignore macOS. They could port proton to run on Metal + Rosetta and then Steam would support all running windows titles on macOS and Linux.
I recognize it’s a hell of an ask, but I think Alyssa could pull it off.
>>adastr+(OP)
I'm a huge macOS fan but even I have to admit that gaming deserves to have a home on an open-source OS controlled by no one (which would be Linux in this case) and that Steam devoting effort to bring first-class gaming from Windows to macOS is like working to escape from the frying pan into the fire.