Among the most profound mistakes of our era, I am convinced we would have to list the shift from the liberal arts to subjects in our schools.
If you teach subjects, one of the many unfortunate things that happens is that students quickly catch on that there is content (i.e. information to be remembered) in this subject. If they like it, they will pay attention, if not, you need something else to get them to do so.
Tests will do, thank you very much. But that's only one of the myriad ways teachers are taught to manipulate the students affections and minds.