Counter-counter point: some VR is working. It's not working for a significant portion of VR hardware, so it is not VR ready.
Windows isn't ready for much of anything these days, so I'm not really sure why you're trying to make that comparison with Linux, an OS that prides itself on openness and getting an insane variety of hardware working on it.
I agree that "VR ready" doesn't have to include every single headset, but that's pretty disingenuous when a significant number of VR headsets use(d) WMR. Linux will not be VR ready until WMR is working.
That's kind of a disingenuous citation, since WMR has been officially discontinued by Windows for over a year, and you can't install it on any new machines, so of course its official use numbers are currently incredibly low.
Five years ago, however, WMR was more than 10% of the VR market (and that's not even including all of the other proprietary storefronts that these headsets were aimed at), and I'd bet that a lot of people, like me, would still use it if it were better supported. Plus that's a lot of e-waste that could be reused and repurposed if we could get 3rd party software to work.
Literally the only reason I still dual-boot my gaming PC is because I have to boot into window$ any time I want to use my VR headset, so, while I would absolutely love it if Linux were VR ready, that's unfortunately just not the case.