I talked in other comments about the legislative implications. But here I would like to give a more personal one.
For instance, I would love to have the answer for myself. Because I have asked myself plenty of times “Am I a woman?”, and that leads to de subsequent question “What it means to be a Woman?”, “What I want to be is a Woman or is anything else?”. I know that only I can answer that question. But I want to know why I have to make that question to myself. Why society considers “being a Woman” something? Because that question didn’t came out of nowhere. It came because I, as a person who lives in a society with other people, see people who calls themselves man, woman or other things. And while trying to decide what I want to be, or what I already am, need to take what other people are into consideration.
Idk, if I’m explaining myself. I’ll give a dumb example: Maybe I want to be an Astronaut, but before becoming an Astronaut I need to know what an Astronaut is. Because Astronaut is a profession in our society, and it can be defined. In this context is easy, because I would love to be an Astronaut because I would love to go to space. But, if I love to be a Woman, why is it? What is the “going to space” of being a woman?