You can also see it like this: if each shaman casts 8 spells in a row, each hitting for 20k (which is over all 4 shamans 32 spells cast), if no spell out of those 32 crits, EP becomes better than acuity in terms of total damage done.
So in my example, if your team does 640k damage without a single crit (over 8 spells each cast for 20k), EP will do more damage from this point (and how likely is it that not a single spell crits when you have 8 times a 65% chance that one will crit).
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