Quote Originally Posted by TelosNox View Post
SS is good for BLM because there is a BLM specific mechanic that favors spell speed.

BLM needs to stack Astral Fire to do more Dmg. His strongest Attack (Fire 4) does NOT create Astral Fire. Astral Fire has a fix duration of 13s. So with more spell speed there is at some time a break even point where it is possible to cast one more Fire 4 without losing Astral Fire. And THAT is the reason why Spellspeed is a good stat for BLM.
Actually, that isn't the reason BLM likes Spellspeed and it isn't the case currently. The reason BLM likes spellspeed is that all the damage for BLM comes from casts.

Quote Originally Posted by TelosNox View Post
RDM does not have such a mechanic. He does not profit from Spellspeed in that way. The opposite is true: Spellspeed is BAD for Redmage. Faster casting = more casts = more mana needed in the same time. If you could gain enough Spellspeed, you would go out of mana.
Technically, RDM does have a mechanic - White and Black Mana generation is quicker underspellspeed. However it doesn't actually gain you extra melee combo's over the course of the fight, and Spellspeed also doesn't affect your melee combo recast time as well as your OGCD recast time or damage - which is a large portion of RDM damage, which is why it is avoided.