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I would put money on a lot of these tricks first being used in games and then being 'rediscovered' by the robotics field.

Almost on a daily basis I would imagine, yep.

We auto devalue everything a human can do as easy. Navigation is a given soon after walking. It's so easy a animal or child can do it intuitively. Until they can't and there are traffic jams.

My personal recommendation is flow field and ROAM. Works excellent for the spring engine

They’re tricks because ideally computational power should be so plentiful that optimizations would be totally unnecessary.

Jevons paradox will kick in, we'll start computing more things instead