Indeed. And if the teaching frees the student from that idea, then we can see that as an opportunity to give it a try. But I can see how it could do harm if t

Indeed. And if the teaching frees the student from that idea, then we can see that as an opportunity to give it a try. But I can see how it could do harm if the teaching is also twisted to the point that it reinforces that idea. Going mainstream almost always implies loosing something important in the process. It's hard to condence years of teaching in a few hours.