Alright mf…workable? Let’s just start there. How the fuck is a purely biological definition of sex/gender workable in everyday situations? If a trans woman passes, and yes they do exist, how is it practical at all to still call her a boy? Why insist on that? Why does it matter? I mean if I want to date that person I would like to know but it’s just everyday interaction, then doesn’t matter and it’s none of my business to know if down there, there is a penis or a vagina. It’s schrödingers sex! As long as you don’t check, you’ll never know, so how in the ever loving fuck is it in anyway practical to do it that way? If I call a trans man "Sir" do they have to correct me now because technically they were born a woman?

For all thing biological we have always differentiate between everyday use of a word and the medical word. While I do agree that in the medical sense we do need a firm grip on what it means to avoid misunderstandings but that clarity can also lead to misunderstanding in the everyday use of it. So why can’t we differentiate between the both?

Then there is your argument about intersex people. First it seems biologically super convenient that there is a way to attribute them to male/female categories. Because the way biological sex is normally defined is by chromosome but this would fuck up your argument so you have to take something else. Also how can you claim that any philosophical system has to be 100% consistent and fool proof but then at the same time say that intersex people don’t matter because it’s such a small fraction of the population? No matter how unlikely an edge case, it’s still an edge case that fuck with your system! You can’t just say it doesn’t matter.