Classes are already discrete, and can thus be taught by different teachers. As I understand, classifying classes into "disciplines" is for the convenience of a

Classes are already discrete, and can thus be taught by different teachers. As I understand, classifying classes into "disciplines" is for the convenience of administrative systems, like university deans. This classification is not a law of the universe, nor of the human mind. One can imagine the negatives of fitting learning into hierarchical administrative models.