These controllers were all working on SteamOS before as far as I know, so I’m interested to see what this changes. My understanding is that previously their controllers just show up as generic xbox controllers, and now they will be properly recognized. We’ll see if this has any other benefits like custom bindings for back buttons and things like that.
If you don’t care about what the physical button shows, steam has an option the swap the layout of the face buttons from Nintendo to xbox in the input settings.