My experience as a native resident of San Francisco(22 years, but the last few mostly spent out of town for college/work) is that most of the people residing there are _tourists_.

That is, people who come there(and many different people do, the turnover is high) also tote along some baggage of what they think the city is about. Vision meets and gradually becomes reality as the newcomers act out their desires, to varying degrees of success. So there is a sort of flow at work. Realization of all the various lifestyles present is a multi-decade process. Plus it changes quickly and incrementally, so as to become nearly unrecognizable. I'm still nowhere near a full comprehension of my hometown.

The broad strokes pg paints in this essay seem more reminiscent of college lifestyle than the character of entire cities. A four-year college is able to concentrate those kinds of ambitions precisely: everyone is at roughly the same few stages of life and so can quickly find common ground.

But in a city, things quickly collide.