It's not a value judgement, it's just life. Villages should shrink to feed towns which should shrink to feed cities which should shrink to feed the largest regional conurbation. Trying to force the flow backwards like the UK does just makes everyone poorer and leads to worse outcomes in social terms.
Bigger cities are just more efficient and effective.
There isn’t any good reason why the outlying regions of the UK should have lower GDP per capita than Eastern Europe.
Seoul is extremely large, at 26M. Reversing even some of the flow would largely still be aiming at million plus cities in South Korea, of which there are five outside the Seoul Capital Area.
How does moving people from high productivity jobs in high productivity regions to low/low ones help anyone? That's the question here. There is no reason one area should have a higher or lower GDP (GDR) than any other. And if they do, that is not a moral judgement on that region. It's just a fact. People seem to want to reduce everything to the lowest level to make it "fair", but regions are not people, regions should NOT be treated fairly. People should be treated fairly. Regions (and countries) are just made up...
Who says it’s high/high and low/low rather than high/high and high/low?
Making people move, to a place that already has well documented housing and transportation shortages, is not really fair. Unequal GDP per capita is not fair either, particularly since that means less ability to pay for services, which are generally lower quality and much further away from homes.
Bigger cities are just more efficient and effective.