On live, AE groups were nerfed by reducing how many could have aggro on you at a time (to ~25, I think). That was a better solution, because those extra mobs would wander away, then come back and kill you when you were OOM. It wasn't just that you couldn't _kill_ 25+ mobs; it was that you couldn't _control_ 25+ mobs, something that's much more important.
In the current scenario on P99, a bard gathers every mob in a zone, then kills 25 of them, but the rest of the mobs are still under his control. So he kills the next 25. Etc, etc. The only thing that changes is the speed of the killing.
So the live solution was better, and I think they should revert the change and do that instead.
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