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Immigration fails when families arent softly forced to change certain patterns. Something like forced language profinciency coupled with decreasing funds if they don't attend classes or show progress.
Furthermore, if the women aren't allowed more freedom or gently nudged to act more freely, there will be no significant generation gap, resulting in a stagnant subculture, instead of a mix of best-of-both.
If there is no incentive to change, people will not. A gentle healer leaves stinking sores.