With new DLC, open borders are pure vulnerability, which I really do not like.



As long as borders are opened AI factions will steal pearls from your territory.



Also, probably for the same reason, AI factions are very stingy from opening their borders, so good luck with those quests that need access to other faction territory (it may be easier to declare war and then make truce).



IMHO, this treaty is ruined as a means to get your units across other faction territory, due to huge vulnerability to pearl stealing.



I really think this needs fixing. Maybe make units unable to take pearls in other faction territory, if not currently in war, or doing it stealthy (to keep Forgotten players happy).





Same thing applies for alliance, since it automatically includes open borders.