The Flying Instructors Rating is a professional teacher's qualification. The aim of the course is to teach the candidate how to teach. I'll grant that it's rather a short course for such a complex skill-set.....It should probably be several hundred hours in length. But then, perhaps the PPL should comprise 100-or-so hours with, maybe a minimum of 50 hours classroom work. You sure don't know much after 45 or, heaven help us, 32 hours.
bogbeagle