What's the point of gender reassignment surgery which doesn't change a person's chromosomes?

All of these variations have an effect on the person’s neuropsychology and thus their experience of their sex & gender.

This can include the SRY gene being defective, being blocked by other mutations, being on the X chromosome instead of the Y, or missing altogether.

It doesn’t have to change chromosomes, because chromosomes do not determine sex.

Women like what they hear while men like what they see, it that true?

The single thing that does determine sex is the SRY gene. Its discovery in 1990 changed everything science thought it knew about sex in placental mammals.

So what happens inside “gender-affirming care” depends upon the patient’s lived experience. However, it’s been demonstrated conclusively by a century of psychiatry trying to change transgender patients’ gender identity to match their physical anatomy does not work and in most cases only worsens their mental health, especially in minors.

Corollary: sex and gender in humans is actually floridly-complex and occasionally very messy.

From an axiology/value theory point of view, how can one say that a diverse society is better than a uniform one, especially given the negative effects of diversity (racism, sectarian conflict, problems arising from extreme cultural relativism)?

In other words, these different levels don’t always sync-up. It is possible for your brain, your body, and your genetics to have different biological sexes.

It’s usually found at the tip of the Y chromosome (which is why we thought sex was in chromosomes), but there are a number of variations that will change a person’s anatomical sex, neurological sex, chromosomal sex, and genetic sex.