Originally Posted by chase
Kinda an intersting question though.
Consider a raid where no frost mages are present (i.e. no WC) yet imp scorch is up. Does fireball make a better filler in this context? (Assuming the rather non-standard 40/10/11 build mentioned)
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Practically no 40/0/21 mage ever raids with WC up. Firstly, it is fuck-all difference to their DPS, which by vast majority is AB and the part which is FrBolt is already at 40%ish crit. Making this 50% will barely give a 6% increase to a small percentage of the damage. Likewise the 4/8 T6 bonus is next to irrelevant, both as 50/0/11 for AM and as 40/0/21 for FrB.
Arc-Fire has never been shown to be better than bad compared to arcane-frost post 2.4. In fact, I'd be amazed if you managed to prove 40/21/0 or any arcane-fire build is better than a classic arcane-fire fireball hybrid 33/28/0.
Arcane builds nowadays are nothing about the filler and everything about the AB. If what you spec doesn't pump AB it's next to useless. Arcane-fire has no IV, and IV is a massive AB pump, because it gets more AB's in under AP, and AP-fully ramped AB is the motherload of arcane DPM gain.
I've said it once and I'll say it again. Whether you fill with AM or with FrB is practically one and the same. The DPS difference is so negligible it's irrelevant. The only reason 40/0/21 is superior to 50/0/11 and why both are superior to 40/21/0 and it's variants is -how many IVs you get- and that's it in a nutshell.