You're patently wrong, have you even used passthrough on other headsets? Apple as usually loves to market things as if they're the first to do it, but like usual they're just iterating on what others have done (and to be fair, usually doing a good job of polishing it up), but to say that passthrough on other headsets can't be used for "literally anything that isn't very slowly repositioning yourself in a room" is wildly wildly false. Other headsets do this pretty competently.