I think ship density is a bit excessive, but workable. I do prefer the game to be more original, where I could see the ships sailing as far as the eye could see, instead of stumbling on them all at once, as it is now, especially when tracking them for quests.
I just think that pushing pirate ships out of the way and sailing through each other (the NPC ships) is something that could easily be worked out.
Sometimes the hunters doing their swirls, spins and pirouettes just looks silly.
I can't tell you how many times (like 10 times a day +) I have to disable the warship by ripping off its sails, off in a far corner of the Caribbean, to be able to sink Hunters without them hiding in the "skirt" of the Warships.
This is no easy feat when sailing solo mind you, even with an alt at the cannons!
The same goes for the land based NPCs. It's silly how they can actually push you through the wall/rocks when they advance on you. I mean, unless you like that sort of thing, which sometimes serves a useful purpose...
But anyway, simple mesh colliders wouldn't be a hard request, especially since it's already implemented for pirates while sailing (not while on land).