My reply was worded to mirror "...I've come to the conclusion that software managers are not needed." which is obviously nonsense.

"Developers aren't some special creatures with one dimensional fixed mindset. They can do whatever that needs to be done."

Yes, but it is ok to generalize in a broad discussion like this one. Otherwise we can have no meaningful conversation. In general managers do not understand developers. And in general developers do not understand management. Those that are good have been exposed to both sides.

I never diminish anyone but it is naive to think that everyone contributes equally.