Maybe true, but in other industries, such as ones that are more "business and engineery, there's less of this obsession with getting an ultra-genius, although we know how valuable engineering talent is.

As a result you get pretty average people. Even the weirdos tend to be just quiet and reclusive. My brother on the other hand, went to work for a smaller B tier to google, and he had multiple co-workers that were just beyond bizarre.