You should check out some of Jeff Geerling’s videos. He’s gotten Portal 2 working on a RaspberryPi5 with an external AMD card through Box86. If Valve invested the same programming/engineering team into that project the way they have with WINE/Proton then it would likely end up just as polished. I super don’t agree that they will switch to ARM though, AMD are working wonders with low-power gaming.