skill-/spellspeed, why is it still here?

[Gormogon]

snip

Enough skill speed allows for another "ability" to be used within your rotation without hurting that rotation. Which is a plus for Dragoons.

Monks dots and GL stacks wont fall off as easily either. So it's a constant uptime unless they are made to move away.

Bards just end up going crazy.

Summoners can cast their dots and spread them quick enough.

BLM benefit so much from spell speed. Moving now isn't a major loss, you can cast thunder 3 instead of 1 or 2, and doing a triple - quad flare rotation isn't so time consuming that it becomes a loss in dps.