I use the Steam Controller still for games like Doom Eternal, Left 4 Dead 2, Spin Rhythm XD, The Finals, etc.

Basically any first or third person game that has aiming improvement, but I am not sold on the Deck touchpads as primary inputs. Tried it and didn't like it. Found them uncomfortable, size too small, and shape resulting in inconsistent swipes as someone who likes to target a consistent 180 on an edge to edge swipe.

So it will be a good controller for dual joystick users who occasionally want to use the touchpads, but not a good follow up to Steam Controller users who wanted a new controller to use the touchpads for a majority of their games.