The 0.1% can get in their jet and go to New Zealand, or buy a Swiss passport with BTC...so sure, place is irrelevant to them. Not so for everyone else.
More or less the entire world is going to turn into a trashfire unless we unite and fix it, so that everywhere is a nice place to live, nationalism won't fix it, it prevents it from being fixed, because we've divided the globe into more and less desirable geometric shapes, it didn't work, next.
I am fully aware that what I describe cannot just be done, but it does not mean it's not the right thing to strive towards. Even the countries we have now have been split up into smaller, warring tribes if you go back far enough. It's always been the resistance, the hardships that have forced us to cooperate, and it mostly still is. Climate activism is a good example, there's a common enemy, "clearly" defined rules of what is right and wrong, it gets people together, even across nationality and religion. But while there are lots of proof that people can cooperate against a common enemy, there's no proof they can't cooperate without one, oftentimes it seems most resistance to that idea is people refusing to believe that others can do it, and then the suggested change itself becomes the common enemy, and prevents it from happening.. There may be some what to make people agree, it's just not been found yet.