[jancsika]

> In my experience, they can be used to legitimize shadow hierarchies or corruption, which sometimes makes the problems worse.

At least in your day-to-day formal hierarchies, those who are negatively affected by the shadow hierarchy don't have anything to lose by acknowledging that it is indeed a power structure. If Alice is the boss but Bob is the one really running all the things, none of Alice's employees are going to lose any sleep by acknowledging the truth of the situation.

But in communities that claim to be non-hierarchical, coming to terms with the existence of a shadow hierarchy could constitute an existential crisis. This isn't a logical necessity-- e.g., members could simply notice and just shrug it off. But most groups I've come into contact with that claim to be non-hierarchical assign great positive value to it, and they get defensive or squirrely about any attempts to uncover hidden power structures within.