A lot of older PC games can run just fine on modern phone hardware. I’d buy a SteamOS version of a phone that has some modular or built-in set of buttons and analog sticks. I don’t know how the app ecosystem would work for sensitive things like banking but it’s mostly a minor issue for me.
That’s actually a great point. If it runs actual Linux, not Android, that’s a decent reason to buy. Valve might actually upstream the patches, if any, so that would enable virtually all Linux distros to run in it.