

There’s always a new 9 year old, 11 year old etc. and always a new gamer of any age, who hasn’t ever bought the game. Same with No Man’s Sky and Minecraft.
You’d likely make way more if you separate games and DLC, but some companies seem to be fine sticking with just the one. You will still make money as you keep adding things to your evergreen game
Should be plenty fast enough to handle Gnome or KDE. I think you’ll also want ZRAM because presumably your RAM won’t be much and your storage will either be slow or limited. Either way, it wouldn’t hurt to enable.
I think both DEs are very touchscreen viable, with the possibility that you may have to configure a teeny bit, like adding a virtual keyboard