Societies that have an immigration system that makes them stronger will do better than societies with a flawed system for migration.
If your society becomes stronger you will be able to conquer weaker societies which will be beneficial in terms of survival of reproduction.
This does not meaningfully depend on how different the genetics is between the immigrants and the native population.
If your society becomes stronger you will be able to conquer weaker societies which will be beneficial in terms of survival of reproduction.
This does not meaningfully depend on how different the genetics is between the immigrants and the native population.