Yeah, I've been Linux-only on the desktop since the early aughts and trying to get the Valve Index working was so frustrating and inconsistent I eventually gave up. It sits collecting dust and I've still never played more than the first fifteen minutes of HL: Alyx (because no game is worth installing Windows for).
Very much looking forward to maybe actually being able to use VR on my gaming computer.
VR on linux has really turned a corner in the past 3 years. Last I played in vr with linux it was perfectly acceptable.
I love the Steam Deck because it is almost entirely a consumer electronics experience. I mean, maybe for 10% of the games I have to edit an .INI file to have a perfect experience, but for the most part I can pick it up and play and not fight with configuration files and shell scripts the way I do at work and with my hobbies. I've seen Windows-based devices that compete with it at Best Buy and I'm kinda shocked that, for a demo, they drop you on an ordinary Windows desktop with visual scaling appropriate for a 20x bigger screen and it is not obvious how to play a game -- such a fail!
Overall I like the experience of installing and running games on the MQ3, I can very much see a Steam-based device that is just as nice or nicer.