Right now, you can go get human surgeries that attempt to transition one gender to another.

Obviously the surgeries are not able to fix many things, and leave scars and all kinds of damage.

Demos of medical labs 3d printing human organs have existed for 15+ years, but a combination of bureaucratic inertia and just flat problems with the printed organs have prevented their use.

Presumably if AI is in charge of the organ production, and it's had an enormous amount of practice doing it and many scientific experiments to understand it fully, much better organs could be created, new skin, new structures, whole limbs, and so on.

This would probably be initially be used to help the elderly - since you can basically replace their bodies except the brain this way - but eventually there would be perfect gender reassignment surgery.

Presumably eventually with nanotechnology, surgical incisions might be far tighter and cleaner - right along the line of cells, cutting structures without damage, and more importantly, suturing might be exact, where all the nerves and individual fibers in each muscle are actually reattached correctly, using protein based glue similar to how the cells bond now, and a lot less pain and inflammation after the patient wakes up - maybe none.

All that pain and scarring and swelling is basically because current surgeons don't have any better tools, this is the best they can do. (medical science does know the reason for a lot of it but has failed to develop tools to prevent it)