Another reason it will be hard for universities to keep students less busy is that they'll worry that without some kind of oversight, most students will just waste whatever free time they're given. And they will! The price of giving the most energetic students room to do even better is that it leaves the least energetic ones room to do even worse. But that's a price that's worth paying, because if the most energetic students do better they could do a lot better, whereas the laziest students already learn so little that there's not much room for them to do worse. So giving all the students some of their time back could improve the average outcome a lot, even if it doesn't move the median.

From PG essay