It's (well) known that learning by teaching beats learning by doing which in turn beats learning by listening (Something Confucius might have said. Modern citations welcome.) The fact that lectures still exist must somehow be due to economic necessities.
Definitely agree, but with the caveat that the teaching occurs after a period of doing. If I learn something by doing it, and then attempt to teach it, I may dwell in the "Why" of it when otherwise I might not have. But if someone listens, and then lectures, that is no better than a video.
