With the NDA lifted on POTBS the floodgates have opened and tons of public feedback is available on the upcoming sea-faring themed MMORPG. Rick Saada of Flying Lab Software has taken the time in a MMORPG.com Dev Journal entry to respond to some of this feedback.
The other advantage to instancing is that it gives us a lot more control over the user experience. We have a much better idea of what the player is going to show up with, and can tune things accordingly, without being as worried about a random level 50 sailing by and blowing the enemy out of the water. We also eliminate the problems of spawn camping or ninjaing of targeted NPCs because only you and your party can enter the instance. Like the warehouse or other door missions in CoH/CoV, once inside it's all yours.
It's not a perfect system, of course. You don't get to watch other people fight as much as we'd like, and if you want to sail around helping noobs you're not grouped with it's hard to do so.
The Dev Journal can be found in it's entirety here.