I recently switched from Arcane to Fire and I've been asked "why" a lot.
First off, realize that I rarely hold myself to a single spec. We have a loot system that encourages offspec gear, so I'm always gathering up unneeded gear in case I need to respec some day.
I still have my arcane gearset and if, for example, Sarth3D were still hard, and I wanted the burst of damage for Tenebron, I'd be arcane. That said....:
DPS
The thing is, on paper, Fire and Arcane do about the same DPS (arcane is ~50dps higher). Arcane can whore innervates and do more, of course, but the specs are pretty balanced on paper -- and that's the problem.
Designing a spec so it does more DPS with more effort? Awesome design. Changing that spec for pvp reasons one patch later so it doesn't actually provide more DPS but still requires better timing and more effort? Not so much.
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