Background-wise Psychic powers are supposed to be effective at countering the powers of chaos, so it makes sense that Chaos based armies would have lots of psychic attack and little psychic defense.
The only current problem there rules-wise is the daemon codex decided to get around this weakness by giving eternal warrior to everything and having psychic powers be abilities rather than psychic powers.
What worries me is that GW tend to use the early codices as 'bar setters' and every other army will get similar amounts of psychic attack as well as improved psychic defense, but we won't know about that until we see those later codices.
As it is, giving chaos more/better psychic attack at the minute just brings them into line with other armies anyway...




The Dude
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