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Originally Posted by Geglash
I'm pretty certain the reasoning behind always clearing AB stacks with AM boils down to two important facts. First like Purify say you still have the 40% chance to proc and instantly consume MB. Second is that if you cannot sustain AB spam until a proc then mana is a concern. Since unprocced AM is alot more mana efficient compared to ABarr it will be the correct choise since it will sustain your mana better and allowing more dps to be done. If mana wasn't a concern, then fishing for procs with more AB's would be the thing to do.
Given the above statement, is it useful to spend a talent point in ABarr at all? For what I read in this thread, you shouldn't use it in any situation but when you're forced to move AND you know that when you stop you won't have the time to renew your AB stack with a new AB or a POM+AB or clear the AB stack with a procced MBARR / full AM. That would be a very rare case in most fights, and you could spend better that point in Arcane Stability for pushback or Magic Attunement for range...
On an unrelated note, does anyone know if Magic Absorption triggers IA? AFAIK resistances mitigate damage, while IA requests it to be absorbed to proc, so IA shouldn't proc from MA. I'm not totally sure about it tho. And if MA triggered IA, would it be profitable to spend 2 points there (considering that I use 3/3 IA and wards whenever I can, for the awesome SP buff and honestly for the fun of it too), or would it be only a slight dps increase?