[fsloth]

'more terrible managers exist than those "good ones" that you allude do'

This is quite hyperbolical. A person can have a life experience of "mostly bad manager", but that does not mean "most managers are bad" or that "most people have experienced bad management".

I've been 16 years as a professional software engineer. I would not describe anyone to whom I was a direct report as "bad manager". Quite contrary, I've been quite happy with most of them. This does not mean a life without conflict or misunderstanding, of course.

Statistically, bad management is of course a non-neglible problem, but the above makes the situation sound hopelessly pathological.