Hwacha goldfish take forever to bring down the armor of a target. Due to the long reload cycle a good engineer can rebuild the armor and almost bring it almost up to full with a post rebuild mallet whack. If the Hwacha holds fire until the moment the armor drops and gets a high hit percentage (from heavy clip or bring close) it is close to an instant kill for some ships. Also a long range volley from the Hwacha can break the enemy guns, making it safer for the Pyramiddion to close. Also don't forget about the shatter power of the whirlwind. It is not as good as a Hwacha, but with heavy clip and a good gunner, you can take most weapons offline at close range.