The number of different branded headsets using WMR doesn't make it significant in any way. Based on Steam hardware survey, WMR headsets only account for 2.84% of VR headsets. Index, Quest 2, Quest 3 account for ~70% of VR headsets in use, and they all work on Linux. Index just naturally in SteamVR and it's my understanding that setting up ALVR for the quest ones isn't that tricky (but I've also never tried). And much of the remaining 30% other headsets work with ALVR too.
And the point of comparing things to Windows, is that if we're stating "Linux isn't ready for gaming because not every VR headset works", then by that definition Windows isn't either. Which you probably agree with, but generally speaking "people" / society view Windows as ready for gaming despite it not supporting every headset.
It's basically getting into the "Fortnite doesn't work on Linux" type of situation now. Some things are just never going to work, and it's because of the creator of those things and not Linux itself, and who cares. Even if the things that don't work are popular, that doesn't mean that on the whole, the OS isn't ready.
Also, according to steam only 1.9% of accounts have a VR headset. That alone makes VR an edge case. but 2.84% of 1.9% is 0.05% of overall steam accounts using WMR. I think Linux can be ready for gaming without WMR support.
Got it. Linux is not VR ready until it supports discontinued headsets. that were previously at 10% of the 2% market, but are now even less (because it's discontinued, and thus only going to continue to shrink).