Earlier quoted context omitted.
At most of the companies I've worked, low-grade managers love to hoard secrets. It makes them feel powerful. Someone gets promoted from Lower Level Manager Grade 4 to Lower Level Manager Grade 5 and they feel all "Oooh! Look at the new things I know!" My mother-in-law is like this with knowing what various relatives are doing. Being the gatekeeper of knowledge gives her imagined power. I guess it's just part of the h…
Why limit it to low-grade managers? I know sysadmins and programmers who behave exactly they same way. They could give you permission or a script to do the thing you need to do but they'd rather have you come to them and ask them to do it. Gives them a sense of purpose, I guess.
I could be off base here about your experience, but I know that some people made the same comments about me when I pushed back on sharing dangerous credentials with inexperienced coworkers. Damned if you do, damned if you don't.