Would just like to point out that although not officially supported in any way, Miqobot works just fine on the Steam Deck in Steam OS without needing to put Windows on it. You can launch it via the “XIVLauncher -> Wine” settings so it opens in the same Proton Bottle. You can then ALT-TAB between the game and Miqo window with the Steam button. Some of the Miqo graphics are glitchy but nothing major.
Obviously works perfectly if you dual boot in Windows, but thought I would throw this out there for what it’s worth if you are thinking of using a Steam Deck with SteamOS and you don’t need Lutris or Crossover or addition Wine addons, just the in-build Steam proton is fine. No messing around!