So you understand that there is a Patriarchy. Great!
And so you accept that somehow, somehow, even though male and female are just constraucts and sex is far too complicated for anyone to understand, the Patriachy somehow still managed to oppress people who pretty much align to the simplistic, everyday version of female. It wasn't great for men who had traits the Patriachy deems female either of course, but that was kind of a backwash from the devaluing of female people, and those men were still in much better places than the women.
So the 100 dollar question - given that Patriarchy did manage to oppress people based on the simplistic, everyday version of sex, why is it suddenly so very very unthinkable to now support those exact same people with the challenges that has brought?
Because Patriachy ain't gonna say "oh gosh sex is really complicated, I guess if we can't know with 100% accuracy who to disempower, marginalise, abuse and discrimate against we just stop Patriaching then". Patriachy will just keep right on oppressing the same people.
All you are doing with your clever "well actually..." and genes dancing on the head of a pin is taking away the rights and power of the people who Patriachy is somehow managing perfectly well to identify as women anyway to fight back.
So please do go ahead and continue to push for a world with subtle gradiation between the social contructs of Male and Female, but do me a favour? Wait until that is also how the Patriachy sees things before you start taking away the rights and recognition that the women who are only women in that cringingly naive, sex based, simplistic biological sense need to protect themselves against how Patriachy wants to treat them.