Medical ethics are shaped by consensual and shared societal codes about what is right or wrong. By that which can be seen as crossing a line and making oneself a god. That is why such issues are so fraught. Because at heart we know that human beings are flawed and make decisions for all sorts of reasons, not all of which have been properly thought through, and yet which have profound human implications not just for the individual, but also for society.
Medical ethics does not prize 'bodily autonomy'. I'd say that is a very individuated, self focused take on it. Medical ethics starts with the assumption that not everything is about us and our individual foibles or desires. That we also have a shared responsibility to the health and maintenance of the group in the long term.
As I suggest, the U.S is very Wild West in this respect, in certain ways, in that people are treated as pharmalogical customers who can make demands on health professionals about their preferences and desires. This is rooted, I feel, in a combination of late stage american capitalism and the cult of the individual.
Which is where I also see the whole trans movement being located. It really is an aptheosis of all things American. Be whoever you want to be; your best self; your true self; all that self referential stuff. and of course, in this sort of culture trans surgeries are re-framed as being 'health care'. When really it is not about bodily health or integrity....it is about knowingly damaging a functional and healthy body - in pursuit of the impossible. And doing this to children, too.