No ACC really hurts that otherwise baller augment.
Tbh I see it more as OMFG magic WS augment. For physical WSs among all Herculean jobs it's only bis for COR Savage I think and by smaller margin for RUN's Dimidiation I think. You mostly care to hit 1st hit on Savage anyway and you get +100accuracy bonus for it. I agree tho, that Savage Blade set for COR is already very low on accuracy and would be nice to have some here. Another reason to use Degen offhand :P. For magical WS its totally OP for all jobs and for that you also have 20 macc. I guess accuracy would be nice to also make it totally OP for hybrid WSs on NIN, but I think NIN can still handle that for the most part while using high accuracy weapons like R15 Aeonic/Tauret.