Your point is understood and I agree somewhat. Harvard and Stanford are also focused on a liberal arts education in undergraduate studies. It is much easier to get the classes you want as an undergraduate at Princeton and Yale if you aren’t competing with the high number of graduate students at Stanford and Harvard. There are only so many Professors they can hire. There is a better professor to a Student ratio, Additionally, the under 21 year olds aren’t surrounded by a massive quantity of more educated 22-27 year olds. It’s a closer to a peer oriented, undergraduate educational experience at Yale and Princeton.