You don't get it, do you?!
Women didn't pick the "he must be over 6' tall"-criterion out of a hat! What they really mean is: "He must belong to the top 10% in height." In other words: Women "grade" on a curve!
As - over the millennia - taller men are selected for and 6'4" becomes the "new norm," women will adjust their demands accordingly: "He must be over SEVEN feet tall!"
Regards,
Why only seven feet?