I think we can both agree that "Labour" doing such an action was/is utter moronic. On that we agree.
"A nation" must be self-sustaining at the minimum for its population. That doesn't mean we should adopt policies which would bring economic ruin to Britain, it means that Britain is able to produces more wealth in exporting the cost of their imports (Like Germany has) and has surplus balance sheet.
In a nation like Britain, to "min-max" for best results, we should have a far smaller population, as such, we should be exporting more people than we are importing.
Uncontrolled migration and unchecked population control severely weakens and ruins the trade balance. While there are other nations which currency need more people in order to reach a best possible parity, Britain is on the other end where losing people would be in our best interest (In a sense, Brits should be going to Poland, who want/need more workers, not the other way around).
An open-cultural society in particular would make this easier for such fluid movement of people. People find it far easier to move to the next town then they do to a new country, especially with different languages and cultural barriers. So a more global open-cultural dominance would weaken these barriers, thus making it easier for people to move as where they are needed.
However, there is also a downside as I addressed earlier, easier movement of people makes it easier for people to move, as such there should be controlled checks on movement of people and unfortunately with our rag-tag nation set-up, this is incredibly difficult.
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