@gamingonlinux if the only depot for a title on a Linux Desktop is a Windows depot, then Steam should already be picking Proton.
What is the typical failure pattern here? Surely all devs upload at least one Windows depot..
Are they uploading a Linux native build to it's own depot, and flagging it Steam Deck only, is that the main occurrence of this?
But as I said, the Proton version should get picked in this case.