The Tesla's do have more than two cameras despite us having only two eyes. I don't think that analogy totally holds. It's more that because roads (and road signs) are designed for human vision and human drivers in order to handle all cases you really need to solve vision and if you do that sufficiently then the other sensors are redundant anyway.

High resolution mapping works for localized solutions, but not in the general case.

I'm glad both groups are working on different approaches, it'll be better for us in the long run imo.