If we use technology to invert that idea, so that kids could watch the teacher's demonstration of the skills and concepts at home (and with the ability to rewind when necessary,) we could allow kids the opportunity to apply and practice their knowledge in the space where they can get help, collaborate, etc... doesn't that make more sense?
(Interestingly, I was trying to imagine what that would look like in an English classroom, and I realized that is, in many respects, similar to what we do already when we ask kids to read the book at home, and then come in and interact with the community to uncover the deeper aspects of the text. Hm.)