"I'm not convinced that it's a mistake for Meta to peruse not being beholden to other platforms."
But thinking AR/VR was the way to go is a failure to read the room. If anything the up and coming generations seem to be recoiling from tech.
Regardless, as Microsoft found, it's too late for a 3rd platform and it seems somehow that there's only room in the world for two.
(Meta would have done better to start up a line of caffeinated sugar drinks.)