You may be lucky enough not to be affected by it, but just declaring oneself non-binary won't alter the fact that others will be able, in many cases, to work out what sex you are, and for females this may be used to their disadvantage.
I suppose that's the dividing line between people who mind and people who don't.
Many women, feminists particularly, care very much about the way women are disadvantaged.
And they are not disadvantaged by dogs, or the weather. They are disadvantaged by men. Not all men, and not as individuals. But in terms of a class.
It's tangible, quantifiable and studiable (not sure that's a word).
And diminishing the importance of women's biology in the way they are disadvantaged is a step backwards.
There is no intrinsic reason why a species who have different reproductive systems should result in the global oppression of the females.
It's a social structure which benefits the males over the females.
And women have done a tremendous amount to reduce that disadvantage. Pushing for laws on reproductive rights, maternity pay, equal pay, being able to vote so we can have a voice. Even after I was married, it was perfectly legal for my husband to rape me (because sex is a wife's duty). We are talking about really, really recent changes.
They way men and women are treated differently has got nothing to do with personality, how they identify, how they express themselves or what they want.
Yet again I am reminded of that woman who identified as a man. After she was raped in the back of a taxi, she sobbingly told the police officer, but I kept telling him I was a man.
Unfortunately, enragingly, devastatingly - that's not how it works.
I have no issue with people who want to identify in a way that eases their path. But do not let something that appears progressive at face value, obscure or diminish the real reason why women have to fight to be treated equally.