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It's not that simple. Of course to be fair it never is.Yes, it isn't about banning cars and it isn't being backed by "ridiculous tree huggers". It makes absolute sense to travel 10 mins to see a doctor rather than 40 mins. Is that really so bad?
I live in a 15 minute village, and the world hasn't fallen apart.
Some things make sense to centralise, others less so. Once you put a nonsense label like "15 minutes" on it, you set a ridiculous goal.
For everyone to be 15/10mins on foot/bike away from most things, impacts logistics. There can be economies of scale which are lost. Also specialisation becomes difficult with things like hospitals.
When it comes to air travel. There comes a point where one centralised airport becomes too big. IMO as a regular user of Heathrow, we are already there.