It took me 4 hours of constant powering on and off to get past the initial update that was always getting stuck at 1 second left. Not a good start, Valve. That said finally got it up and running. Plugins and tweaks are set up. I guess the first game has to be Aperture Desk Job in the spirit of Welcome Park for Vita and Astro's Playroom for PS5.
EDIT: Oh wow, some games actually have official control layouts that's not just using XBOX controller presets. They have functioning L4, L5, R4, and R5 already.