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It can be useful. It’s a great surface for doing any form of outdoor exercise on.
Pretty absurd to pretend any of its uses come close to outweighing the negatives.
Claiming it’s “not actually useful” though is just wrong.
If a thing does more harm than good, it isn’t useful, the people using it are just selfish.
That’s an interesting new definition of ‘useful’ you have.
It’s certainly more sound than yours, which apparently requires nothing more than “it feels kinds of nice to step on” while it poisons the ground and eliminates yet more of your local ecosystem.