There is no one reason why people transition. Science does not have an answer.
There might well be a scientific reason behind it. No one doubts that. Like anorexia. And other disassociative conditions that rely on the denial of reality.
And gender dysphoria is a real and crippling condition.
It's not a deliberate attempt to enforce gender stereotypes for the sake of it. To piss off women.
But that is the effect.
Every single narrative about children who are trans, talks about gender stereotypes. Every single detransitioned story explains how gender stereotypes are at the heart of it. A rejection of toxic masculinity, or expected femininity.
Masculinity and femininity by their nature are stereotypes. You don't get transwomen say the reason I transitioned to be a woman is because I wanted to reject all my feelings of femininity.
If it's not about reinforcing gender stereotypes, I'd like to know how it doesn't.