Been playing psyker exclusively for a bit now and I feel like the feats were designed in such a way that they wanted to make it so that there werent “different builds” necessarily, just set your feats and play with the weapons (staffs) you prefer. I dont know if the other 3 classes are like this but i get a sense they are, perhaps besides the ogryn. it would take a big rework, but what would be cool and make a lot more sense in my mind is to have essentially 3 feat paths based on how you want to play the class. for example, id think there would be a staff/ranged psyker, a brain burst psyker, and a melee psyker, each with trees that enhance those playstyles. similarly, while i havent played the other classes, i imagine the veteran as a sniper/assassin, a more suppression/support focused tree, and melee/grendier or something. give people actual ways to lean into the unique aspects of their class. im biased but the psyker especially needs help in this regard.