A common complaint of the Pearl quests is that they feel unrewarding to do. A small fix for this would be to move the strident trident from Crab King's drops to Pearl's store alongside the pinchin winch. Reasoning:
Gnarwails are uncommon and when you do see them, you usually don't bother to fight them because their horns are only used to make the trident and it takes literal ages before you can make it.
The trident is the most powerful ocean weapon but it is only available after fighting the hardest ocean boss and right before the player unlocks planar weapons. If Pearl gave you the weapon then her quests would be preparing the player for the fight by providing you with the best weapon for it.
Another Pearl task could be playing the trident for her like her love used to. The trident would also make Pearl's fishing tasks easier and more convenient to do.
My main point is that the trident is unlocked too late, particularly after the fight it would be most helpful in and if Pearl instead gave you the trident blueprint, you would be able to use it for much more of your ocean activities.