It just feels a closed collaboration between Samsung and Google at this time. And there is too much unknown.

Meta apparently isn't onboard, and they don't need to. Meta knows they can't rely on Google or trust Google, so they built their own Android based platform.

There really are just a few big players in the VR world, most of which build their own platform. Meta focuses on the lower end, Apple and a few others focuses on the higher end (I am still not sure that's a real market where there is money), and Sony has just about abandoned their platform. That's it.