This time we are talking about the release of official support for the Xbox Cloud Gaming cloud service with a novelty from Valve. That is, yes, formally the platform worked before, but there was no native support for device controllers.
“We’ve worked closely with Valve and the Xbox Cloud Gaming team to bring support for Xbox Cloud Gaming (BETA) with Xbox Game Pass Ultimate through the Microsoft Edge Beta for Steam Deck <…> We’re particularly excited about this ourselves as we believe it could open new features in the Linux gaming community.”