Blue mage logic is based on a level 75 game

[Prothscar]

Triple Attack is more effective for both DoT and weaponskill damage than our gimped Double Attack trait. It's a marginal difference, but a difference nonetheless. Whether you'd be best off setting the extra two spells to get triple attack as opposed to setting another trait or more utility spells is situational.

As for Dual Wield III being overpowered, no. It will be incredibly expensive to set with a requirement of 6 spells, the five that we already have access to being mostly 3+ points and two being utterly useless (Blazing Bound and Mortal Ray). We will more than likely be getting a sixth spell for the 99 cap. Occultation is incredibly inefficient MP-wise, keeping it up consistently isn't really a reliable means of damage mitigation especially given the fact that it is wiped by every AoE that there is.

Berserk and Warcry are the only abilities worth mentioning, and are buffs that CDC greatly benefits from in most every circumstance.