Also a PC only game is niche enough, no PCVR game will ever make VR mainstream. Really, the mainstream VR game is Beat Saber - that alone has probably sold more VR headsets than any other app or game combined.
The only way to make VR mainstream imo is to offer it at console prices or less and make it standalone, which is exactly what the Quest is doing. It's really unfortunate it requires an FB account. I guess they justify it because Xbox and PS5 both require online accounts too.