As someone with (at the time undiagnosed) ADHD, I found lectures nearly useless during my undergrad and grad courses. I'd do my best to try to force myself to pay attention, but after 20 minutes, I'd realize I had been in a different world for the past 5 minutes, had missed key details and the rest of the lecture didn't make sense anymore. (I know the obvious response is to ask questions, but teachers and other students don't respond particularly well when I'm literally asking them to repeat what they just said).

Recorded lectures and particularly flipped classrooms were a god-send for me the few times I had courses structured like that. I could rewind and go through what I just missed in videos if I zoned out, and the interactive nature of flipped classrooms really helped me focus and absorb materials in a way that doing homework by myself just couldn't.

Its disappointing that most students didn't appreciate this form of learning. I'm hoping that as the new generation of students (the khan academy generation) reaches college age, these sorts of techniques will become more accepted and easier to implement.