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.

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.

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.

Why do some people never get to on a date even though they wanted to? Are they just too ugly and weird for everybody?

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.

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

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.

Did you know God exists? 900+ answers later and no atheist has yet to be successful. Day 8 of asking Atheists to provide a SINGLE argument that demonstrates a cause for the beginning of the universe while avoiding the problem of infinite regression.

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

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.