Normally I would agree with this argument but when you're contending with human biology and all of its limitations I don't think it quite works. There's always going to be a percentage of the population who'll struggle with stereo content, regardless of how high you crank the framerate or whatever new eye tracking tech you introduce. Unless Meta finds a way of beaming content directly into the brain (a scary thought on its own) their product will never find the same widespread appeal that Facebook once did.