if I remember correctly you can't use it on your psychic traits, yeah. But since they all level up as your ego gets higher, it's not too big of a loss.

They might've patched it, but there's a way to save scum with precognition to farm ego I believe. Since there's a chance to absorb ego from esper hunters, you get just enough psychic glimmer to have them start spawning but very weak, run around the salt dunes until one spawns, then use precognition and kill them, going back in time if you don't absorb their ego, and repeat. Don't abuse the power too much though...