Do top WAR use Fracture?

[Kuwagami]

snip

fracture has a potency of 300 as a WAR. Not 220.

In your calculations, you'll get 1500 potency with the fracture, which gives 1125 potency under Defiance.

The counter part is "only" 1035 potency under defiance, so from a strict dps perspective, using fracture is better than not.

That said, it's not factoring the potential need of the damage reduction, nor the TP loss. If you know you'll be short on TP, fracture becomes a bad choice as once you're TP starved, you loses a lot more.

In short :

As OT : yes

As MT : depends. If you know you won't need the damage reduction or if the fight is short enough that you won't be TP starved, use it. If one of those situations is likely to happen, don't use it until you know for sure it's safe