Dual weild assassin

What is the use of dual weild double claw weapons? The damage doesn’t seem to stack.
So why should anybody use it

one reason is claw weapon block skill, it blocks both attacks and spells. it can even block some aoe like fire enchanted explosion
second reason is exceptional and elite claws have skill boosters on them
third reason is elemental martial claw chargeups, the ones of the left side, charge up twice with two quick hits while dual wielding. the chargeups in the middle dont require claws at all, so left side is claw focused build