Immigration could use a re-look
After getting stuck with a 1-family name town I really dug into the immigration system in the game. I've seen it work before, a teen from one village goes to another to find work. The problem is for some reason in the most recent versions I've never seen it working again. I don't know if it's version-wide or some specific situation related to mostly player-controlled villages but I'm not seeing it happen anymore.
For instance, I had a region with 3 player-controlled villages and 4 non-controlled villages. All of the villages but the one I was actively working on were essentially "done", they were built out and had no more jobs/houses and all of them had many teens of both genders waiting for their chance. Meanwhile, my player town had nearly a dozen open homes, houses with no people, houses with a man, houses with a woman, and not once did anyone move to this village. I ended up deleting the village and starting over to make sure I had 2 family names locally.
Again I'm founding new villages and building up much faster than the population can fill spaces, yet not once do teens from the full villages move to the new villages. All are same-culture, excellent relations, all within 500m of each other and I have the game set to 1km active radius so all are active. But no one ever moves between villages anymore.