I'm hard pressed to blame Valve for that. They've made massive contributions to a VR ecosystem that almost everyone seems to have stagnated in developing for.
I love VR, but it is something strange to think I'm still mostly playing the same games I bought 10 years ago. Some big players got in on it, but only to port their titles (Bethesda, mostly). Some devs have made some really cool things and development has never ceased for them, but Alyx is an outlier, really. As much as I'd like to see a follow up from Valve, I'd as much like to see that kind of energy from anyone.
You could point to Meta VR exclusives, but they hurt themselves through exclusivity.