Fireflybob, leaving aside the limitations question, the thing about a lot of stuff in the PPL syllabus is that it will not be practised at all once the pilot has their licence. PFLs, steep turns, stalls etc. Most weekend PPLs will not practice them until they have to i.e. once every two years. It's understandable, it costs a lot of money. Since a lot of the real close shaves I have heard about are in the circuit it follows that there is a risk that an out of practice pilot will bugger up an emergency turn and pile in rather than just do a normal steep turn. I do believe that one of the reasons the Firefly (T3A) was withdrawn from USAF service was a chap doing a run and break and flicking in, and he was presumably much more current than your average PPL. I teach it during an aeros course but it would just alarm your average PPL, or make them barf, or both.