Or matter more, as chromeOS is killed and Android comes to laptop form factor?

...what steam devices? Steam Deck and Machine? I work in video games(at one of the largest publishers - worked at other two in the last few years) - and while we usually do some testing on the steam deck it's literally just to see if the windows version runs well. Full on Linux porting effort like Larian did for BG3 is very very rare and extremely hard to justify.