A couple of points in no particular order ......
While I'm not going to spend time and detail justifying it, I happen to believe that FULL spin training is essential to any pilot's knowledge. I say that as a military former QFI.
Nigel Lamb, mentioned acouple of times above, was formerly a military pilot with some time on the Vampire but I beleive most of his hours would have been rotary. He too was a military fixed-wing QFI, and in fact was responsible for sending me solo! I learned spinning from Nigel, and am happy to have since passed on what I know about it to my students.