I tried to like the Steam Controller, but there was no point for me qith the Xbox controller right there. I terested to see what this turns out to be and what thr selling point is.
better compatibility with steam input than most other controllers thanks to it being identified as a Steam Controller rather than an Xbox/PS/Switch controller. Meaning that gyro, touchpads, haptic feedback, analog triggers, and other stuff will all work flawlessly without needing any major reconfiguration so long as the game is being loaded from Steam (which you will be doing with most games anyways, even non-Steam ones)
I'd imagine that unlike the Steam Controller 1, the SC2 will be based off the Deck input scheme which is far better suited for most games (excluding the lack of gamecube-esque trigger stops) so you won't be missing a second analog or a decent D-pad or a good ABXY position, etc)
The Steam Deck control scheme is so incredibly versatile that it's viable for 85% of the games you'd ever want to play. Games where controller and KB&M have seperate benefits like better aiming on Mouse vs analog movement on controller (like GTA or Uncharted or God of War) are now effectively solved with a best-of-both-worlds solution. Hence why I'm chomping at the bit to see and buy this thing, it's all controllers for all men