We are - deniers aside - all plentudists these days.
We actually welcome and cherish the chaos and complexity of a multilayered world - welcome and cherish communities composed of many wildly different little neighbourhoods.
'The more the merrier' is today our motto.
We are all Jane Jacobs and not Robert Moses today - we are all Henry Dawson and not Howard Florey these days.
We no longer have a an almost physical phobia against the mere thought of anything that is all mixed together.
Be that a bunch of different New York City ethnicities, New York City neighbourhoods or various unknown compounds in New York City crude penicillin juice.
We no longer seek to replicate the chemists' process of separation and purification outside the beaker and flask.
We no longer practise it on human cities ( via the doctrine of widely separated uses and strict zoning) or on so called human 'races' ( with white separated and superior to blacks and Jews).
Adolf Hitler, Robert Moses and Howard Florey all tried that during WWII , and all failed and all were eventually discredited .....