I believe the problem is that this often not taught for a variety of reasons, one of which is the instructor in many cases is afraid of the stall him/herself. Bring back spinning would be one solution. X/w ops also fall into the same category with some instructors avoiding flights in such conditions. You can quote as much as you like from pt61 but it does little to improve instructors or the end product. Sadly I have seen CFI's and ATO's fall into this category - with the resultant poor end product.