The Xbox Series X/S controller’s share button should now bind with Steam, while multiple controllers can be used simultaneously.
The Xbox Elite Controller has also seen further features added, including programmable rear paddles. The PS5 DualSense hasn’t seen as many upgrades on Steam but there still worth finding out about.
Here are the Steam Controller patch notes from Valve:
Added a setting for extended Xbox controller support. The option can be enabled in the General Controller Setting section of your Steam settings and requires a driver installation and restarting your computer.
Extended Xbox features include:
The ability to bind the Xbox Elite controller paddles in controller configurations