best class for game completion?

Why does a passive atk boost matter when they got the pomegranatetyest dps out of the 3

I argue they don't, but even if they did that has nothing to do with them having a passive damage boost over other classes.

Every ranged char and their grandmother has decent hb

So what? Hyper Body gives 60%, Decent gives 40%. Decent is a piece of rotten dog's ass.

IIRC the 90% boost comes with charges with palies,lol thats an actual reason?

Yes, because you asked for it. Maybe you should rephase what you wanted.

and what does ignoring all def matter? the only boss that it matters at is empress and HF with pot lock+draining you hp, plus even then your cap is 1m

Ignoring defense matters at everything above Chaos Zakum. Pot lock is fixed by being partied with a Bishop, and being able to hit the 1 million cap repeatly in a short amount of time while all the other classes are doing only about 20 - 40% of that.

i<3 proving you wrong

Proving me wrong? Lol, what a joke. You asked what Dark Knights had the other warriors don't, I gave you a list, and then you gave poor reasons as to why those reasons don't matter and that is proving me wrong how? Check yourself before you wreck yourself bro.