There are Only Two sexes/genders. There are humans that are born with parts of both and they are the ONLY 'transexual' humans and can make That decision by what 'works' best. The current Lie of pretending The INSANE CAN Become another sex, is impossible and doctors Know that. Any Dr. that would do this to a child is an insane criminal along the lines of Frankienstein.

It is going to be very difficult for them to find loving, long term partners, because you have fucked up their bodies in ways that are going to complicate relationships

Incorrect. Finding two mentally ill people to have a long term relationship will be next to impossible.