You sound like an experienced admin, but I was trying to put myself in the shoes of a new admin who is new to XF and especially the permissions system. If it is powerful, there is no denying it, it is anything but intuitive. Intuitive means it works without question, it just makes sense, but it doesn't. The number of questions about it in the forum, this resource (which starts with: Having logged in to quite a few installations to resolve permission issues, it's clear that a lot of people haven't quite grasped the concept.) and the fact that Brogan links this resource in his signature proves that this system is not intuitive and creates a lot of misunderstandings and confusion.
But it's not an attack against XF, I'm just making this observation. It's just my point of view.
I wouldn't want to offend any susceptibility, some people seem on edge right now...