You can only gold burst offensively, good luck doing that while cursed.
Also, what if you get 5Ced into a curse loop?
You saw the second Gally got hit by a 5C he burst that shit, because he knew what was coming.
If you burn a burst on a combo, what happens if you get hit into a loop?
It'd be different if Arakune's HP was low, but it wasn't at the time.