Better than the usual FP contribution from an AC, but I'm not getting your point and sure wouldn't moderate the FP interesting or funny (if'n I ever had a mod point to give). Perhaps you care to clarify (and even offer a more focused title)?
I do have some complicated thoughts on the topic. Maybe I'm even qualified as a resident of Tokyo to care about the problem? Calls for my ancient and little used sociologist's hat, however... But I really wish I had studied more psychology.
But I can reduce my answer to my stomach. I like Indian/Nepali food and I like trying new restaurants. I also like "atmospheric" coffee shops. (And sometimes I like to try something else.) I'm pretty sure I'm never going to run out of new places to try in Tokyo. However I'm pretty sure that would be true for many of the largest cities in the world... (AI angle via reviews?)
So how about the flip side of the coin? Why are so many people so strongly motivated to move into large cities? And on that side of the ledger things look really strange in Japan...
A few days ago there was a major fire that consumed about 170 buildings. That was in a small town far from Tokyo. However many of the buildings were empties. They call that an "akiya" for empty house. I've heard an estimate of around 100 empties destroyed in the fire. It's not just that no one wanted to live those vacant homes, and that there are places that will actively encourage people to live in vacant homes, but in this case it's worse. If those empty homes had been removed the rest of the community would still be there. Apparently they were the main source of kindling that made the fire so bad.
Another angle on the extreme demographic concentration. From the central part of Tokyo it is possible to walk to a suburb named West Tokyo. Takes about an hour on foot. Not long ago a bear was sighted in West Tokyo... Yesterday's news included a story about capturing (and killing) an extremely large bear near another town... Kind of like a war now, though I don't trust my (AI) source for this next item: Have the few remaining (and mostly quite elderly) bear hunters actually killed more than 4,200 bears in Japan this year? Actually seems quite possible. Nothing else to stop the bear population from increasing. They only look cute and fuzzy when they are quite young. But there was another story on the news about eating bear meat...
Combining the three branches? At least the bears rarely break into empty houses. No food smells. And so far I haven't heard of any bear sightings in the central parts of Tokyo... So in conclusion lots of people move to Tokyo because they like food and dislike bears?