I think a key point is that computers can be extraordinarily valuable for education, but during a lecture or during a seminar they're usually more of a distract

I think a key point is that computers can be extraordinarily valuable for education, but during a lecture or during a seminar they're usually more of a distraction because a goal of that is a teaching interaction and engagement between people in the same room, and modern computers have so many tools to connect people for totally other purposes. So if someone says "but computers are so important for being able to do online research and collaboration!", that's absolutely right, but that doesn't mean they're a consistent net positive during face-to-face teaching sessions. Bret Victor (who just came up in another thread) has been pretty adamant about his claim that some future kind of computational media could be a huge plus for collaboration and teaching environments—yet that present-day laptops and tablets are not that and tend more to isolate people.