Depends on the game. TOTK ? Ehh. Mario RPG / Wonder / + Rabbids? Yes. Check for posts about running X game

i think that was scratching some peoples screens so they got rid of it

yes and yes

unless you install windows on it or stream it through the cloud you wont be able to

could you try the steam-installer package instead of the Steam package from the ubuntu store? this could be a Steam Snap issue

I used this video by AntVenom and it has a simple setup guide for Prism Launcher