@sashin Well, you asked an anarchist so you're getting an anarchist answer lol
I'd say horizontality. Lack of transparency tend to result from (and also result in) hierarchy. Information asymmetry is a form of power. You still have a certain amount of cliques, dishonesty, etc, but it's not structurally reinforced in the same way.
The most transparent org I've been in in my food co-op. If anything, the problem is that more info is disseminated than people are usually willing to bother reading.