I can't remember in the last 3000hrs flying along straight and level and the aircraft suddenly departing into a spin.
Being arguamentative, how many engine failures in that time? I'd suspect not many, yet we learn about those too...
In many ways I completely agree with you, (and yes you're far more experienced than I) however, much as I think new drivers should get put on a skidpan, if only to scare themselves into a bit of common sense (I sure needed it), I think new pilots should have a similar experience.
First spin, first aerobatic manouvers, your mind is tripping out about what the view's doing outside - with a little familiarity we get over that and the thinking brain is freed to be a little more analytical - we can function as PIC again. To the average PPL a 60degree bank is an 'unusual attitude', that can't be healthy - if anything odd does happen the freak-out factor is high. Personally I recommend an aeros course to anyone who'll listen, (post PPL).
Truth is you shouldn't get into a spin accidentally. Truth is also that these things don't happen straight and level. Most likely reasons are excess testosterone (I believe you can self-teach aeros uk side?) OR distraction - high stress, head in, you may well miss the signs. Pretty sure the moment the bottom drops from your world and everything starts to rotate you'll snap back to. Yes if it happens at low level you're dead, but..
My pet beef is that in all of these avoidance exercises you know what you're expecting to avoid. How effective will you be in the real world?