I was under the impression it was for things that only really work on windows, like game pass or stuff with anti-cheat. IMO, the game mode makes it so that you don't really have to learn linux to use the steam deck.

I had to think about this for a bit but I think I do both a bit of swiping and typing with my thumbs. I think swiping is especially useful one handed, imo.

I've poured hours into total war shogun 2 but I don't think I've ever fully completed a run.