Originally Posted by charred
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No offense but you haven't done a single DS heroic boss on your mage, so I really don't think you have any qualification to state that there is "no movement intense fight in DS".
Every single one of the fights you specified is vastly different on heroic, requiring much more movement, multiple targets (heroic zon'ozz has many adds scattered across the room) or specific raid composition strategy for soaking mechanics (heroic ultraxion puts a debuff on you when you soak hour of twilight preventing you from soaking it again for 2 minutes).
If you were playing fire in your 10-man and nobody was providing the 3% buff, and you were only playing fire for the damage, then playing arcane may now be a better choice, but the most optimal choice remains getting a ret paladin.
If you're in a 25-man raid there is still absolutely no reason to switch to arcane as you will still do more DPS as fire on almost every fight.