Originally Posted by
Verain
My understanding is that dots still scale with haste, right?
Blizzard SEEMS to have two models with haste. The first is the "caster" model, where you cast your spells faster (more apm and dps from that), but your secondary resources, whatever they may be, aren't really affected. Dots scale with haste, forcing you to reapply them more often. Your global improves with haste.
The second is the "melee" model, where your autoattacks go faster, but you don't have faster access to moves. Haste scales up your resources, however, increasing your apm. Dots do not scale with haste. Your global doesn't improve with haste.
Some specs live between these worlds, but if I had to guess a reason, it's because mind blast builds "combo points", and that's not the part of your rotation they want changing with haste- you guys are built on the "caster" model.