My uncle actually for a time used a Steam Controller instead of a Mouse because he hates the ergonomics of a mouse/keyboard layout and because arthritis. it was somewhat impractical because he had to switch to a keyboard whenever he needed to type something, but I think it kind of worked for him because he is a MTG pro player so his work doesn’t require a lot of typing, before that, he was using a 360 controller with the chatpad thingy as a mouse/keyboard combo, his ideal combo would be a steam controller with somehting similar to the xbox chatpad though sadly that doesn’t exist yet, I think he went back to a traditional mouse keyboard setup for now.