It's better in that people can move to where there's work so you ideally don't end up with a shortage of jobs in one place and a shortage of workers in another place.
People move to improve their life! If the want family ties, they can stay put, but historically they want a better, higher paying jobs and escape from racial or religious prejudices of their old surroundings.
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[ 1.2 ms ] story [ 33.1 ms ] threadwhy is that better than a society where people have deep roots in their local community that span across multiple generations?