I've often been in classes myself with instructors who would not use any active learning techniques. They were some of my worst classes. I believe some individuals may believe so strongly in "old school" methods that they refuse to adopt these practices. I find active learning greatly improves knowledge retention and allows the students to practice applying the knowledge they have gained. My students stay alert in class and really seem to enjoy the constant participation in their education and gain confidence that they truly can understand the material.