Sex is a product of evolution. Humans have the same sex anisogamic sex system as all mammals. This is based on females that are organised around egg (large gamete) production & child birth and males that have organisation for sperm (small gamete) production.
Sexual reproduction is existential for 1000s of species. No sex reproduction = no babies = no people. Sex evolved FOR reproduction. Sex is a reproductive strategy common to humans, zebras, elephants & whales..... & many plants exhibit sex and loads of insects etc. It is not human-centric.
Pretty much every part of a person's being is mutable. People are afraid of change and refuse to recognize the possibility if it upsets their perception of the world or themselves
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which is a nonfalsifiable argument, but it also means they have no logical recourse against the counterargument that trans women have female souls.
I know how reproduction works, but I don't get your point.