[azalemeth]

There is an absolutely vast amount to learn at university beyond that obtained by listening to a lecturer lecture. Sure, lecture are great, but they're one aspect of gaining knowledge about a particular topic. I personally think that for some skills you really have to struggle and try to solve difficult problems with them, and having a teacher of some variety you can interact with who points out your mistakes is just as, if not more, important as listening to lecture be delivered.

[swayvil]

Yes, beyond "lecture" there is also "lab". And a step further there are "studio" and "shop" classes.

Lecture and talk is cheap. Talking with a microphone to a wall of students even cheaper. Youtube is the cheapest.

Otoh, studio time, tools, materials. A vastly stronger sauce, but much more expensive.