I’ll be real, before the Steam Deck existed, I was toying around with the idea of either building something basically like it, or how to slap a Steam Link into that kind of formfactor (3d printer, breadboard shenanigans, etc.)
Was very pleasantly surprised when Valve announced exactly what I wanted. Have been happy with it ever since.
This has to do with in-game cinematics and video players (VRChat has youtube players for example( ), not streaming the game to another device