I remember having the equivalent of a major-church schism at the flight school over teaching a student to fly at MCA. One school of thought said that it was a good thing to teach the student not to be afraid of the stall horn, and to learn the edges of what the airplane would and wouldn't do. I like this approach, and I frequently taught it to my students.
Another contingent of CFIs believe that this is a horrible thing to do, because it de-sensitizes the student to the stall horn and they'll be 'too comfortable' playing around at AOAs that they shouldn't be playing with in the course of normal operations. While I understand the sentiment, I disagree with it as an unacceptable risk.
But these were the fun, spirited discussions we had on bad weather days.