Cause they should have more staffes and less shared common weapons.
This is the class where the “mudane” weapons are really a non sense. I can understand they (FS) let them now…
But if I want to play with an axe, I don’t play a psyker.
Several have been suggested here. If there is one class that need more specific weapon, this is this one.
Ogryn already have only class specific weapon…Psykers need something close to that.