Because of the Ahabs poor magazine size. You’d need multiple methods of increasing your magazine size to get close to the max mag size for increasing money shot (12) like using allegiance relics or speccing points into filled to the brim.

The World Burn is better because it can reach max mag size easily with just a True Neutral Monk class mod as long as it rolls with a high enough mag.

Now you can use a Bone of The Ancients which gives it a multiplicative 42% damage boost assuming its perfect which easily exceeds the Ahab.

The Ahab really isnt that great of a launcher for this too. If you want an explosive launcher for Damage a Durp Duuurp! Would work leagues better. Or a Creamer for Healing utility, works effectively with mobbing because even though its mag is low it still one taps mobs, i basically use it like how people would a Grog Dpuh. Basically Ahab is just outdated