Both sex and gender are spectrums, and neither are distributed as neatly and bimodally as cis-heteronormative society (and your fourth grade biology teacher) would have you believe.
No one here is arguing this. The commenter you replied to even acknowledged that his definition wasn’t all-inclusive. The point people are making is that even just knowing whether you were born with a penis, a vagina, or somewhere in-between has its uses, esspecially in a medical context.
Trans people are whatever gender they tell you they are, and just like you wouldn’t ask cis people for their chromosomal make up to confirm their gender, there is no rational reason to do so to trans people before you accept this (outside of transphobia).
Again, you’re arguing against a strawman. Everyone here has agreed with this sentiment. The disagreement is in the specifics of defining, sex not that of gender, and esspecially not the validity of anyone’s gender.
No one here is arguing this. The commenter you replied to even acknowledged that his definition wasn’t all-inclusive. The point people are making is that even just knowing whether you were born with a penis, a vagina, or somewhere in-between has its uses, esspecially in a medical context.
Again, you’re arguing against a strawman. Everyone here has agreed with this sentiment. The disagreement is in the specifics of defining, sex not that of gender, and esspecially not the validity of anyone’s gender.