Sorry, I'm a little confused. I thought the original question was about the basic PPL course (in Europe 45 hrs flying, UK NPPL 32 hours). So I'm left wondering:
a. Why are we talking about IMC? Students should be being taught how to avoid this and there is a specific exercise where they are taught a 180 turn out of IMC.
b. Are you saying that people should not only experience spins, but they should also been done in (simulated) IMC?
As Bose said, I'm not against spin training, I just question the level of relevance to the basic PPL course.