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It's a neat idea, but it would be too easy to abuse. If your army has a few mastery levels, you can fairly easily cripple the most important buffs of your enemy. For most armies these days, psychic powers are all about getting the important ones off while treating your less important powers as a nice bonus. This means that your oponent will often hae one power that is obviously more important to them than others, and you can easily focus on messing with that power.
You could, for instance, easily shut down that enemy hammer hand that they were counting on going off so that they could deal with an MC or mess with the farseer's doom power that his banshee friends were depending on for their damage output. It makes it really easy to shut down your opponent's psychic phase, and having blessings turn to maledictions or what have you just makes it worse. Plus, if you're running a psyker heavy amy, you'll have plenty of nasty tricks you can do in your own psychic phase, so unless your opponent also has abjuration, you've essentially hoarded one phase of the game for yourself.
This isn't as bad against armies with lots of psykers, especially redundant psykers, but your average marine or even non-psychic-spamming eldar list will be punished pretty hard.
And "abjuration isn't useful if your opponent doesn't bring psykers," doesn't help balance it out because you simply won't take abjuration powers if you know your opponent is playing, say, Tau. You could integrade abjurations into other psychic power tables, but in addition to being messy, that will just make people go, "Oh, I rolled abjuration but don't need it. Guess I'lls wap that for a primaris and grab something off this other table too since I wasn't going to use that power anyway."
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