The first rule of medicine is to do no harm. It's an ethically grey area to intervene with something the body is doing naturally that isn't putting the person's life at risk. The technology available today for gender transition is crude compared to what will be available in the future. I know intersex people who are pretty unhappy because medical professionals chose the wrong intervention in childhood. Only adults of sufficient mental faculties who are under the care of a doctor should be making these tradeoffs. That's how trans worked for ~70 years before recent political activism forced the medical industry to loosen its standards.