Critical thinking skills. Being able to synthesize information. Maybe I could have learned it some other way, but for me, university was where that stuff really "clicked". It's also a nice little ease-in to the real world from living with your parents - like a test run for life. Learning how to be on your own but with responsible adults not too far off, a sort of built-in safety net. I'm tired so I apologize if I'm not being super clear/expressing myself well.