People don't wanna talk about it at all because it's too close to trans-ness being a mental illness but imma come at this from entirely the opposite direction:

The NO.1 predictor of a cluster B personality disorder is a consistently invalidating childhood environment.

What's more invalidating than spending your whole childhood saying "hey I think I'm actually a-" and every single person around you cutting you off right there and saying "no you ain't." Psychiatry ain't shit without social context but psychiatry is also coming to accept that being constantly invalidated as a child gonna do your brain the fucky-wucky.

It's ok to accept that trans ppl are at an increased risk of personality disorders due to our completely fucked societal norms. Accepting that we're at increased risk of mental disorders due to societal bullshit =/= saying being trans is a mental illness. If anything, it's an indictment of the society we live in.

TLDR; trans ppl are at increased risk of mental illness =/= transness IS a mental illness and we still deserve to acknowledge the trauma society done did to us.