Because the Steam Deck is my all-time favorite controller. A controller that’s just like it but without the bulkiness would only make it better

Because PC controllers these days are nothing but different variants of the same Xbox and Playstation controllers. The Steam controller is different from the rest of them, at least.

None have additional buttons on the back that can be mapped as new buttons, they're all just rebinding existing buttons. Steam deck is pretty special in that regard. I would REALLY like to have those four extra buttons available for couch PC gaming.

Because they're all shit, each current controller has some kind of downside when wanting to configure it for games.

Either Steam input doesn't recognise extra buttons, or the ones that do have issues with being Bluetooth only.

I've tried the vader 3 which was great, but unrecognised so needed extra software to remap for each game which was never as simple as steam input and required me to use a mouse and keyboard which isn't great with a htpc setup.

And then recently I've tried the horipad for steam, this is almost perfect except for only two back paddles, the face buttons being weirdly shaped so the some of them stick when pressing them and the Bluetooth is shitty.

If steam input allowed the full use of generic controllers instead of ones that have been explicitly set up, I'd have no issues, I'd be able to find the one for me. But because they don't do that, I'm waiting for the steam controller 2 because a full layout just like the steam deck would be the dream.

Because nobody's making something like the Steam Controller 1, but better, which is what a SC2 would be, one assumes

If someone else were to make one I'm sure people would cream their jeans if they weren't bespoke and expensive