Privilege in argument, especially regarding human physical matters

If it's true that the trait could have evolved in its present adapted environment, sure.

But there is as yet no reasonable and well supported explication of the evolutionary origin of many major human features, at least some of which do not appear to have been "adaptive" in the first place to the natural environments currently inhabited by humans. Bipedalism, for example. Esophageal complexity. Vitamin requirements and water/salt management. Opposable thumbs. Hairlessness. Loss of canine tooth dimorphism.

To take one: We know that primates were quadrupeds. They still are, regardless of environment, except for one. The question of what kind of environment it would have been, to which hind leg walking by a quadruped was adaptive, is exactly the issue.

 

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