@logge:
At first I didn't even understand how this could work, but they have a good documentation and are very helpful on the LVRA discord. Once you see it's like a client-server-like thing, it becomes easy. Yet, setting up Envision can be a bit tricky. You just have to try and learn while testing around. It's a bit of a learning curve, eventually once it's setup is done, it just works.
Unfortunately not all games work with Monado (for OpenXR) and/or OpenComposite/XRizer (for OpenVR), but here you can check the protondb-like vronlinux database. It has entries per game for Steam VR, Monado, WiVRn and ALVR.
I do see though that Envision is not made for the average user, but which Linux user is this "average user" anyways, hm? :grin:

edit: Ah yeah, for me it doesn't matter if I start Envision or Steam first, at least I didn't run into any issues so far, and I have started it in arbitrary order many times. But before starting Monado via Envision, VR controllers and basestations have to be turned on. They are working on detecting them on the fly, but for now you have to start up things before the software itself.