Optical-based AR is still very imprecise and requires advanced long post-processing to make it somewhat accurate (~1m precision). Usually, most startups quickly bring an 80% solution (a few weeks) and then get stuck forever to make it usable/precise. During that phase they trick their VCs/investors that a solution is right around the corner, internally the ones responsible for the initial phase gain promotions and block the ones that poke at holes in their solution that could never make it to 95%. I've seen it happening first hand...