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> I’ve always been extremely sceptical of “its vestigial” or “that body part is bad for you”. I mean, surely if either were true, selection would have done away with it.

That's not necessarily true - if something is vestigial it is no longer affected by positive selection pressures; it won't be selected against until it is harmful. [0]

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

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