Nobody is taking an "everybody is the same" position. People are taking an "everybody should have the same opportunity" position, which is an ethical stance.

The root comment in this chain claims that women's natural imperative is to raise children, with the implication that encouraging women to do startups is therefore wrong. That's also an ethical stance, one justified by the naturalistic fallacy.

All animals, people included, have built-in behaviors. But that tells us nothing about what the right behaviors are.

You expressed puzzlement that somebody was objecting to using the natural fallacy to justify discrimination. I tried to explain.