The differences between bodies is extremely important to people. But genitals begin growing from the same material in the womb, and merely end up joining differently in the end.
Realizing this destigmatizes natural variations in bodies. And in turn it does away with cultural standards for what genitals “should” look like.
Accepting this means intersex bodies, trans bodies, disabled bodies, and on become a part of the social standard rather than being counted as Other.