Even with the atma of the gales aero V shouldn't be able to match a BlizzV. Beyond not only gives Ice potency +30% but MAB+30 while atma of the gales has only wind potency +30 on it. You are sacrificing some damage from an MAB Atma to gain more DMG from the potency atma, while using mostly ice nukes as BLMs gives you both MAB and Ice potency in one atma + Baying Moon (+30) or Ultimate for +50 and MM for refresh and INT+50.
Ontop is blizzard V's base dmg higher than aero V's
It can be closer but matching it could be a stretch.
Also I agree that a BLM does have a much easier time nuking as the job is not bound to special conditions and possibilities to alternate spells into higher potency/less MP cost etc. It is in fact point and nuke, the rest being gear swaps. Occassionally checking on mana wall and enmity douse reuse timer and you're good to go.
Simply pressing macros does not cover the thought you need to put into stratagem charges and how to use them, klimaform/weather timers and so forth. Simply said: nuking on SCH requires at least somewhat more thought and effort than it does on BLM. That's a fact.
Oh and rambus I know you said the same about T4 nukes. I just like repeating this request in hope for SE to read it. I'll try to do it the mellowy-way and keep mentioning it.