Probably the single best course I took in college was an advanced course on Metaphysics (my degree is in philosophy.) It was during the summer, so the class was about 3 hours long, and there were only 3 other students and the professor. The level of discussion and feedback was incredible - there was very little lecturing and essentially just discussion and Socratic-style investigation into the paper of the day.

I’m not sure how this experience can be replicated by an online lecture. Even group video chat is a poor replacement for a small in-person discussion group. I can see online videos replacing the lecture format for larger or general education classes, but to me personally, the real value was in the small discussion groups.