Have yet to test the Deck or any other portable console-like PCs, but about Linux it is pretty straightforward nowadays for running Windows games, mostly requiring some occasional tweaks and troubleshooting, but nothing major. ^_^
Also in the topic of facilitating usage, maybe you'd be interested in checking Heroic Launcher if you have games on Amazon Prime, EGS and/or GOG? Makes running the respective platforms' games pretty easy too.