Genghis,
Thanks
CaptAirProx,
I suspect that most of us see the value of students' exploring stall and spin.
The problem is the aircraft... such exercises ought to be done in an acrobatic aircraft where the behaviour has been adequately investigated.... in normal cat machines, the potential outcome might be difficult to defend at trial ....
Consider that some popular light twins, in particular, have very nasty propensities to do surprising things if you hold them into the stall ..