Why are the stats so poor? There would seem to be only two possible explanations. Either instructors in general are poorly trained to teach spin recovery, or the aircraft are inadequately maintained. I guess there is also some sort of middle ground in that the wrong aircraft types are used, but this must ultimately come back to the instructors who are willing to teach in this type of aircraft.
My own experience, and probably because it has been out of the syllabus for so long, is that there are not that many instructors comfortable with spinning themselves, let alone prepared to sort the student out when he freezes on the yoke / stick.
One arguement is that the student will benefit just from experiencing a fully developed spin. There may be some truth in this, and perhaps it should be a requirement that students have a spin demonstrated to them. Maybe instructors would be happy with this, and maybe the benefits would be greater than the risks.
Spin training, as with aero training, is a whole different ball game. The instructor needs to be comfortable with allowing the student to see the spin fully developed, and repeating the exercise sufficiently so that the student is comfortable with the recovery. Argueably an accidental spin is most likely to develop from an unusual attitude, so the instructor may want to go an address this issue. Seems to be that is a lot with which to deal. Would the instructors be comfortable with it, is there time in the training to deal with it properly, and are the aircraft available for spin training?