I agree that there is mileage in seeing spinning during the PPL course, but that realistically can be done in another type, it doesn't need to be done in the main training type.
I'm teaching a chap for NPPL at the moment, and we're doing the main course in an AA5, but will be demonstrating the spin in a single sortie in the C150 (which will double as a useful but non-syllabus lesson in how to get to know a different type).
G