Actually, I think at the undergraduate level it's even worse (you still learn a lot of generally useful things in GED/high school). I would guess that what most people actually learn at the undergraduate level is completely unnecessary for their eventual careers. There are certainly exceptions, but it's a good rule (consider this: why do you need a bachelor's degree before entering med school? We invented a "fake" major for this requirement--premed--but objectively, it's completely unnecessary)