In the Charles Berg book "The Unconscious Significance of Hair", it's explained that hair on the face displaced the tension humans feel about their hairy piss and shitholes.
He was Freudian in his approach and a believer in the Oedipal theory, which holds that sons want to fuck their mothers and murder their fathers. Because male puberty causes hair to grow on the chin at the same time as it emerges on their nutsack, the connection, Berg conjectured, was clear: the sprouting of unruly beards is the equivalent of an erect penis, defiant and out there for all to see. Which in turn explains why feeble men have felt the need to shave them off.
Once upon a time, the Walt Disney Co. banned employee beards at its theme parks. Other companies had similar expectations for staff appearance. Perhaps as a result, the beardless face suggests conformity.