You could already do that with gamenative. There are many videos.

Also you can run steam os on arm portables. https://armadaos.dev/

So all this was possible before the Steam frame was launched

Sure, but I would like to point out that gamenative largely exists thanks to FEX-Emu, which was started at Valve's initiative, and which Valve has stealthily funded since its inception.

Macbook neo has been playing PC games for ages now.