Exactly! Even a provincial 15 year old noble kid knew that Bene Gesserit occupation was politics, and BG sisters were everywhere not even pretending, but all powers seemingly turned a blind eye to it until God Emperor, and he was clearly training them. Maybe they just have a lot of dirt on everyone, plausible considering their other memories and breeding program involving a lot of nobility.

Oh well, at least in the abovementioned Caladan trilogy Brian did accurately portray them as incompetent and far cry from later ones like Taraza or Odrade.