I'm not asking for instant restoration. But this is a problem that is specific to these island regions. The vast majority of regions in the Far East, and every other continent, have other regions surrounding them on most or all sides. If they were devastated by war and by being rogue, they would get peasants immigrating in from several regions, as many as four or five. Six in some cases. Not one.
Think of it as a balance thing. Sure, they may only have two ways onto the island, but isn't that why it took, literally, RL years to break Arcachon? And the only reason it actually happened in the end was because of all the infighting and rebellions in Arcachon that broke them from the inside.so, yeah, the regrowth is slow because of the two sea routes onto the island, one of them a fortified beachhead. But if regrowth was going to be faster because of more bordering regions, you'd lose all that extra security.
