Fair enough, good points, but you’ll find that habitually unshod people have surprisingly thick (and yet still perfectly sensitive!) soles that are very resilient to puncture and yet do not experience pain when walking over terrain that makes us grimace. That doesn’t pertain to all of your hypotheses, and even those it does apply to are not ruled out by it, so I concede you could be correct, as could I. The real question is: which these(s) can be proven. That’s what’s interesting about this article: that they have found archeological evidence that supports an... I’m struggling not to use ‘obvious’ because I’ve been chided for using it... but a... very plausible hypothesis.