The Steam Deck was also gave Proton a huge boost in visibility thanks to Valve’s Steam Deck ready branding, which is something only Valve could do thanks to them having control of Steam. Apple will need to figure out a way to similarly boost visibility for Mac compatible/playable games that isn’t just putting them on the Mac App Store (which I can’t remember using for anything other than an update in months).
I think that they talked at one point about how they had it running at 60 fps at one point, but they opted for a more “stable” experience (translation: the amount of frame drops probably would’ve made Cyberpunk on the base Xbox One blush).