Of course all that is with no engines. Assymetric thrust in a twin is more complicated, and I expect you've got less margin before you damage the airframe.
From what I’ve heard it’s actually pretty frightening the first few times, but that’s the point - do it enough to recognize what’s happening and make the response automatic.
I was told that spin was not because it could damage some of the instruments which have gyros.
We did it anyway (in a Cessna 152), and it only took about 1.5 turns to recover. Great fun. Easiest way to induce a spin was flaps down during stall.
https://www.faa.gov/documentLibrary/media/Advisory_Circular/...
Many commercial pilots (like skydiving pilots) have CFI (because while training, you need to meet a certain number of flight hours, and you might as well spend them on CFI).
The older CFI's usually seem to be up for it. :D
Perhaps because the training wasn't being well done. It's a pity, because to most pilots a spin will be very disorienting unless you are used to it.