That ignores that plenty of people are in cities because of the amenities that concentration allows. If you want niche/specialty restaurants, grocery options, entertainment, medical care etc. you will have to be in a large metropolitan area
The opportunities you get in a city of 3million is different from 600k is different from 250k. I've lived in all of the above over my life. You can find niches in each. However the larger the city the more options. The smallest city had great Thai food - some family from Thailand moved there and opened a restaurant, but there was no Vietnamese, the next largest city has both, and the 3 million city more options than I was ever able to check out. (there are cities > 10 million around with even more options).
Yeah big cities provide a one stop mall like experience for 'experiences and culture' for people who need that curated for them. To me it's the most boring, non-organic, empty experience, but I've always preferred non-mainstream scenes or to hunt out my own entertainment/style/beauty. I can see the draw for people that doesn't work for though.
It's funny that cities various 'interesting districts' are normally just suburbs that the city absorbed. But yeah, suburbs are just awful places without their own culture or interest (unless absorbed, then they are a distinct interesting district).
