In my mind the primary issue is the lack of quality of replication. VR tech is fine, but the quality is just not there. iPhones had a screen quality where you could barely tell there were pixels and eventually got to a high enough quality where no matter how close you looked you couldn’t see the pixels. That is the level of detail needed for VR to be get truly beautiful and our screens and processing power are simply decades away from them, let alone the quality of sound and the other senses.