If your argument is that public identity is more important than private parts, Beatie still loses because she was public about using her original parts (and would have been even if she wasn't famous - you can't hide a pregnancy from everyone forever).

"Who decides who's really a man or a woman? Do we decide for ourselves, or do we decide it for other people?"

I can decide that I come from the planet Jupiter. If I tell you that, you may disagree with me, and you would have every right to do so. I can try to change your mind but I can't force you.