I also wonder if they’re ever going to have a non-handheld console

Seems unlikely. You can use the Deck as a (very weak) console, if you really want to. I just don’t think it makes sense for PC gamers, as most of them are choosy about their hardware.

HoloISO, last I checked, was not updated for a loooong time, but we do have ChimeraOS and Bazzite, which are similar projects, and hopefully one day Valve will release a “general use” SteamOS.