This is a super dense neighborhood in Shenzhen that has a massive, CO2 spewing highway driven through the center of it. How are you supposed to cross the highway? Why is there a highway here? Why are we still building highways despite climate change?
Look at that picture; there are tons of trees there. The grass coverage is comparable to (or less than) that of a soccer complex.
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Go to a public golf course on a nice Saturday. See how many people are there and how many of them are rich twats.
It's not a question of maximizing exercise potential per square foot, anyway. You don't want to be wasteful, but recreation does not need to be as economical as possible.
the sportfield in bottom left of the shenzhen pic is clearly a bit smaller-->golf course bigger, but i've seen larger sportfield complexes in real life so i'll accept the premise they're comparable : a) way more users are on team sports pitches at a time b) they should also be culled and more efficiently organized even if they're more socially justifiable