Originally Posted by
Nick
Yeah, that's about what I figured.
Besides that in any army's case I'm generally against incorrectly breaking the RAW when there's no "interpretation" to be made on rule that's unambiguous when read carefully, in practical game terms, it has a hugely detrimental effect if you're playing summoning with heralds and horrors (as I said, to the point of not even bothering to bring your best tournament army that you've been practicing and modeling).
By the RAW, the Heralds will get 3 roll on malefic on top of the summoning, which means much higher chances to get cursed earth and incursion, which are key (you are going to have a very hard time if you don't have some units that can cast these in addition to the primaris each turn). Not only do you get 1 less malefic power per herald under the FAQ change thanks to having to burn 1 for the summoning primaris, but you are less likely to get the powers you need on the 2 remaining powers because you have to give up one of the bad powers for Summoning which means you can roll that one a second time instead of re-rolling for the ones you need.
For horrors it's even worse - you only get 1 roll on malefic, so under the FAQ change to the focus powers, now they have to burn it up for the primaris. All of the sudden you never have horrors casting summoning + incursion or summoning + cursed earth anymore from those units, which is crippling. Overall an army that's already pretty dependent on chance for power generation and casting has way less access to generating two key powers, and will have less units capable of casting those spells. So that's the problem for Daemon players with changing the Psychic Focus rule.