My typical rotation for DD use to be Burn II to lower the resistances and then Profundity II + Fire II for mega dmg. Then I would use Shock II + Thunder II (u can see the pattern) to lower resistances for each respective nuke ability. I am wondering how the burn, shock, etc type spells compare to purge.

Burn II (RNK 36) states "Lower the resistances"
Purge (RNK 22) states "Rendering the target's elemental alignment neutral"

I am interpretting "neutral" to mean 0 resistances for any school of magic. If that is true why did they develop a Purge II at 46 which I haven't gotten. It can't be 0 because you would never need another ability rank above Purge I.

If purge is better, it would free up alot of abilities on my bar if my rotations could be:

Purge, Prof + Fire II, Thunder II, Aero II, etc
instead of
Burn II, Prof + Fire II, Shock II, Thunder II, etc.

I don't have time to do a controlled test on the same mob over and over again and was curious if anyone else had already investigated this?