Right........
Our 4 thumbed 'cousins' can open them easier!
HMmmm... Why haven't WE 'evolved' a foot thumb? It'd be a LOT easier to get yer socks up offa the floor!
Maybe our shoe wearing habit has eliminated the 'pressure' to HAVE a thumb there!
I've always been curious as to why evolution would have caused man to LOSE his hair, which would seem to be a distinct disadvantage as then man would have to waste time and resources to provide for himself coverings to protect against the elements. You'd think that the ones that didn't have to expend the extra energy to do that would have more time to find food and thereby increase chances of survival. Not to mention, not dying from exposure.
No. It's an adaption to a life of upright walking on the ground rather than swinging through trees.
Our feet are much more efficient for getting around on land than are those of the great apes, which spend a lot more time in trees.