on necromunda they make a thing called a psi-hound this is basically a psycher that is equipped with a psychic enhancing neural-crowns, which keep them docile and are also further controlled by coded auditory and olfactory triggers. usually they use highly inbred mutant psycher abominations they make specifically for this purpose but also are known to use regular non-inbred psychers the Psykanarium has aquired from other sources. although they keep the best mutant psychers for personal use by house Helmawr they also send some of the lesser ones to serve the empire. since this tech both enhances psycher powers and makes them easier to control it would be logical to just put one on every psycher that is not the emporors food and is otherwise unsuitible for use by Adeptus Astra Telepathica. given the views on psykers and how there normally treated turning all less skilled ones into what amounts to a pshyer servator seems like something they would do but the tech is rare off of necromunda. so my question is why aren't they mass producing the psyhounds psychic enhancing neural-crowns for use across the empire they clearly know necromunda has this tech as they get an amount of psyhounds but nope so why ?