There are a rare handful of games that need it, stuff that needs to run specific software to fake server access for dead MMOs, that sort of thing, but that ends up feeling like a list of “maybe someday someone will solve the puzzle of how to put it on Deck,” not “valid reason to dual boot.”

The Deck has made me a Linux convert, and every day compatibility through official channels and Proton fixes gets better and better. DSMapStudio, for making FromSoft mods, now works with Proton Experimental, no extra Wine stuff needed. Compatibility only improves over time