Since it’s so quiet here, let me start :)
The Steam Controller, albeit being discontinued in 2019 is still going strong here.
I like that you can easily replace the two AA batteries and even though the original wifi dongle broke somehow, it is possible to just link it with Bluetooth as well.
Meh,I tried it playing dead space and it wasn’t working well. If course, it has less moving parts and the quality is great but the touch pads were a lot less responsive than regular analog sticks imho. But that may just be my personal taste.
No, it is true that console ports that are highly optimized for the standard controllers do not work as well with the Steam Controller. Same is true for old emulators that need a real dpad. But for pretty much everything else the Steam Controller is great.
That’s the biggest weakness of the controller IMO, you have to tweak in the input settings on the game, build a controller config on Steam and learn to use it. Muscle memory is a helluva thing.