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Jane Jacobs said in that book:

” but look what we have built with the first several billions: low-income
projects that become worse centers of delinquency, vandalism and general social hopelessness than the slums they were supposed to replace. Middle-income housing projects which are truly marvels of dullness and regimentation, sealed against any buoyancy or vitality of city life. Luxury housing projects that mitigate their inanity, or try to, with a vapid vulgarity…”

I notice similar things happening in many cities, from U.S. to China. It is a big question for us.

Cities need ” a most intricate and close-grained diversity of uses that give each other constant mutual support, both economically and socially.”