Porting in and porting out can easily be changed. Doesn't have to be changed for existing areas but they could easily make a new open world area that's "too dangerous" for the npcs to set up a camp and aetheryte there.
As for the others that don't understand what the OP means by open world content for some reason, he's essentially asking for a open world dungeon. An open world area or areas that's filled with monsters you can't just casually walk by without having to worry about being killed with some difficult boss monsters that spawn every now and then that actually drops something useful or desirable.
