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that specific example was a little bit hyperbolic, but i think there is likely a general improvement with the ability to sight vision and small discrepancies in things.
Also you're talking about visual clarity, this is specifically about being able to detect motion better.
as for why this matters for shit like not falling over and dying? Well cool little story, sometimes humans like to move around. Things around us move in relation to ourselves, so it could be expected to see some benefit in that regard as well.
I'm not arguing good vision is not important for general survival, but I think hunting has a higher ceiling of usefulness for good vision than anything else humans did in that period
that's certainly a possibility. It's likely to be a significant part of it, that's for sure.