After reading through the psychic powers section of the game, I have some serious concerns over the Divination psychic power path. While the Divination power section specifically states it's up to the GM how much information they give the Librarian using the power, most powers do give an expectation of the type of information you will get depending on your PR when casting each power.
My thought is Augury, Divination, Lifting the Veil and Psychometry will tend to give the players so much information that they won't need to do any roleplaying to get vital information pertinent to the adventure. If I as the GM, start messing with the information I give the players and use the "Warp is fickle" excuse they give in the book, I can see that it could cause resentment from a Librarian player. What good is taking a power path if the GM is going to nerf it using the warp as an excuse all the time?
I'm not even sure what psychic powers my group's librarian (Rune Priest) will even take, but if it were me, I'd be sure to select a few Divination powers for my character.
Has anyone given thought as to how they'll deal with this issue?