I see the common complaint that the base type and endurance charge bonus basically go against each other and yes I agree. However need we not forget that there are jewels that convert one stat to another.I am just speculating here. But I wonder if that tought was in the supporters mind when coming up with this unique. No idea if those jewels would actually make it viable. I don't have close enough to the end game experience to say so.
As mentioned, just speculating.