[rtkwe]

They don't have to have an individual benefit (or even be an intentional thing), evolution isn't great at perfecting things it deals very well in just good enough and doesn't really have a great mechanism to deal with small issues with small effects to reproductive strength. See the recurrent laryngeal nerve for a pretty simple example of it. [0] It has little/no downside to reproductive ability so there's no reason to 'fix' it evolutionarily speaking.

For the vast majority of our time evolving the biggest issue was spotting a stalking predator or hidden danger before it could hurt us or spotting food better than other chimps/homo */lizards (at various points on the evolutionary history). For that quick efficient pattern matching is what you need not solid reasoning about large groups so that's what we've got.

[0] https://en.wikipedia.org/wiki/Recurrent_laryngeal_nerve