Why didn't 4th Job AoE's get a cooldown?

It is when their single target damage far outweighs that of a bishop/mage.

Data taken from my DPM thread:
- Single Target (Bossing) damage difference:

-- Bishop - Spamming Genesis on BOSS target (non elemental): 32.393% DPM (costs 777.700 MP per 10 minutes Onyx Apple Time)
---> Spamming Genesis is even cheaper then using Onyx Apples...

-- 2H Paladin - Spamming Blast on BOSS target (non elemental): 77.161% DPM (costs 3m mesos per 10 minutes Onyx Apple Time).

DMG Ratio Difference at Bosses - 2.38x For a Paladin
EXP Gain Difference at Training - 5x For a Bishop

So, actually Genesis should only have halve it's power / halve it's speed (3 seconds cast + 3 seconds cooldown after each attack).

And THEN when they have same stength, EVEN then, Bishops would still have Holy Symbol / Heal & Revive...

That's why don't get why there isn't a cooldown of, lets say, 5 seconds after each Genesis cast...
That would equal classes more closely then what it is now...