Being trans myself, I will gladly tell you no one can change their biological sex yet
This is wrong.
“Sex” is determined by myriad inter-related physical and chemical factors which are absolutely capable of changing.
The view you are adding whatever credence being trans gives you to the discussion not only is incorrect it is adopted and propagated to back-justify oppression.
Do not do that.
A woman who was assigned female at birth and later lost her uterus to cancer wouldn’t stop being referred to as “female, late 40s” when her chart is being filled out by EMTs. The distinction you are attempting to hold up is meaningless to how “sex” gets used socially and epidemiologically.
It is not “pointless nitpicking”. It is very important holding fast against allowing very determined forces of hate any foothold whatever.
I argue 3 things:
No one “in casual conversation” considers someone “sexless” when they lose their gonads to cancer, nor do you know the “sex” of anyone to whose sex you have referred in going on high-90s percent of cases by your ridiculously narrow definition—I can’t imagine in those cases where you find yourself considering using either term you jam the person with a needle or jerk them off into a cup and bust out a microscope to check motility.
Finally I’m not sure what you hope to gain by your pedantry—they’re never gonna let you into the car.