But that's different from whether it's important that Facebook has real competition, or that there's now a reference device for not just VR on Linux but a bunch of other compatibility tooling and infrastructure for Linux on ARM specifically.
Even if it tanks, I think the Steam Frame will be a big deal outside of VR, sort of like how if you're on Linux you're probably benefiting from the Steam Deck's existence regardless of whether you own one. (I also don't.)
I'm not sure that I could say that about any of Facebook's headsets. They're big for their niche, but making a Para Para game semi-mainstream isn't really the same magnitude for everyone else as enabling you to play PC games on your phone.