I guess the point is that a lot of those other reasons are caused by managers.

Gotta put up fights with other teams to do your job? Manager should be unblocking you.

Got no tools, bad computer? Manager should be putting up a fight.

Low salary? Manager should be negotiating on your behalf.

But on the other hand, maybe I'm just old fashioned.

Today, in the world of micromanagement, line-managers aren't expected to be much more than cannon-fodder to be blamed by C-levels when developers are unhappy.