Mainly due to shortage of very good lecturers, no? I can not see a better way to cultivate the professional pride than to attend lectures of truly remarkable professors. The style, the manner, the attitude go much beyond the dry proofs. I'm an applied math major.
Does lecturing have a place in disseminating ideas? Sure. I love that scene from Oppenheimer when he attends Heisenberg's lecture, being exposed to cutting edge ideas directly from the mouth of a truly remarkable professor. Watching that gave me a better appreciation of lecturing's original purpose and historical importance. But that's very different from teaching well-understood concepts and skills.
It was subtle, but easy enough to pick up on if you were being attentive in class..
Sorry, but I must disagree. There is much more to learning process than just the material itself. We are social animals, so the emotional aspect matters to the majority of us. Highly technical fields are not an exception. The attitude of the lecturer and his reaction to the questions from the audience, sidetrack discussions -- it all counts. At least to me and the people I have known.
At the same time, lectures of those with no charisma is a real torture, no doubt about that.