I would interpret parent’s “open” as “non depending on birth”. As in people can freely apply to live anywhere with readonable amount of bureaucracy. I think we

I would interpret parent’s “open” as “non depending on birth”. As in people can freely apply to live anywhere with readonable amount of bureaucracy. I think we have that but in one direction only: if a highly educated resident of a wealthy country wants to move somewhere else it will usually be easy. The farther we move from that spot, the harder it goes: it might require ungodly amounts of administrative work, enough bribing money, or demonstrably unique skills. I agree with you that it brings up a lot of things to consider.