Ulti and I have been discussing this. Apparently SoulKnives are overpowered as well. He worries about 9 ranged Int damage a turn to wizards.
Anyway, it does bother me too, but I don't use psionics in my campaigns, so I can't speak from experience. However, the Keen Anarchic Holy Vorpal Greatsword at level 10 isn't too appetizing to me.