Hopefully this won’t be limited to the Steam Deck specifically. Making a native app means Linux, so unless they have something directly in the app that checks directly for a Steam Deck, it should work on desktop Linux too. And with more SteamOS devices coming, it’s likely in preparation for that too as NVIDIA want in.
Browser is capped at 1080p and has more lag, as stated by other users. I havent tested it to confirm