while there's much wrong w/ credentialism, it exists for a reason; there are SO many people w/ worthless opinions, & you need some way of sorting thru them. it's rather difficult & work-intensive to come up w/ your own system, so defaulting to that of polite society is reasonable
his claim is in all likelihood true for very many people, esp those w/ face profiles; that method will also. generate many false negatives, but that's not exactly much of a concern for most, considering how many people there are in the world.