They do exist.
The follow you around wherever you go, ready to jump into whatever problem you are working on.
They ask to be cc:ed on every single email you send (or you feel the need to do it).
They are there to catch you when you fall and tell you why you fell and how you should have done it their way.
They don’t go on vacation because the “team always needs them”.
It’s hard to grow as an individual and a Leader when you have a Helicopter Leader over you, monitoring your every move.
It’s hard because even if they don’t mean it (they might be very nice people) what they are saying with their every action is “I don’t trust you” and if the trust isn’t there for you to be there, then maybe you shouldn’t be there at all.