Basically nvidia shadowplay for linux
Steams custom controller profiles alone used on Steam Deck are killers for me. Nothing else amounts.
Steaminput is a massive deal, it supports gyro, remapping, profiles, and extensive customization. XInput can’t compare and the epic games store relies on developers for everything. That’s the reason why I will always pick a Steam Controller over an Xbox controller.
XInput can’t compare
XInput is X11 API and SteamInput can be used through SDL or directly.
I wish, the first one still stands as the best controller imo but it still has so much that can be improved (USB C, dual thumbsticks and trackpads, two back paddles, improved haptics, better gyro, better ergonomics, etc).