That's why students remark on the absurdity of the swimming requirement. We have evolved a set of answers to this question that, as a culture, we all subscribe to. We believe that education is about science, humanities, and the arts. Inside universities we find Colleges of Arts and Sciences. These are usually the cornerstone of the university and typically predate the founding of other schools within the university.
Many universities have engineering schools or drama schools or music schools or journalism schools.
Business schools, medical schools, and law schools are part of a modern university but are so looked down upon by the other schools that they typically do not teach undergraduates and their faculty are often made to feel that they are not really part of the university at all. At my university the medical and law schools are located ten miles away from the main campus. This is not at all unusual. Some state university systems put these schools in entirely different cities from the main campus. There is a general ethos in any university that says that members of the professional schools are really not like the rest of the faculty since they are not really academics.