Even if that's true (a big if), all we can infer is that that's what hunter / gatherer societies seem to naturally coalesce around. It's not what modern society is coalescing around. Some folks take that as a sign that modern society is fundamentally flawed, but I'd rather be born as a random person in modern society than a random person in a pre-historical hunter gatherer society. Perhaps that's just my bias towards modernity though.