The same could be said of people today. Many people have the option to move somewhere with better work/lifestyle options but where we are at holds us for reason

The same could be said of people today. Many people have the option to move somewhere with better work/lifestyle options but where we are at holds us for reasons like family or simple inertia. Also likely there would be pre-existing tribes that would have some territorial ownership to good hunting/farming grounds, even if only used nomadically.