I’ll be waiting for a Z1 Extreme version and steam OS for other things then the steam deck and something like this would be a solid drop in for a PC “Console” for my TV. My steam deck does great but for the games I play on the couch there are maybe a few that just having an extra bump would be perfect for.
Are you using X11 or Wayland? I have had issues with X11 at 4k not doing more than 60hz. Only will work under Wayland for me.