Have I done any spinning? Yes I have... As a Grade 1 and former CFI.. 40+ years and 25K+hours
If a lesson is not that positive e.g. spins in a C172 with all the restrictions etc.. then there is no point and it is indeed a stupid thing to do... Can you imagine the patter that goes with a demo for this...
Certainly a 'Low G' thing except for the recovery if heading to be lumpy custard..then the statement for ageing aircraft comes in... I have a number of friends with older aircraft who found a 100 hourly turned out $$$ due to cancer etc requiring new wings... not something you would want when the ASI hits the red zone and you pull up quick in a panic..