Wow, this was a really detailed response! You're awesome 😅

I think I agree with you in a lot of places here, especially the idea that perhaps sex as a classifier isn't always going to be accurate of the correct medical care someone will need. As a trans woman myself, I can attest to that from experience with my doctor. My doctor's office is not designed for people like me, who will still need a prostate cancer screening one day in the future, but also will need a breast cancer screening as well. I think this is something that can be improved over time, and I like the idea of having specific notes like "has had vaginoplasty" or "is on a course of female hormones".

I've considered the idea of some aspects of sex being bimodal, whereas others are binary. I feel the same way in that I think it would be kind of harmful to classify people as "more female" or "more male" than others. It almost puts people's sex into a hierarchy, and I feel that can be dangerous in a world that's already rooted in sexism. It's almost a way for the patriarchy to enforce more expectations on those who are female.

It's understandable that these kinds of thought experiments might seem useless. In fact, this question doesn't really matter at the end of the day because we're talking about something that won't be possible in our lifetimes, if it becomes possible at all. Of course, if medical technology comes to a point where this is possible, we should definitely be applying all said resources to help people in need, such as those with chromosomal disorders as you mentioned. Trans people are (usually) healthy and shouldn't be the top priority by any means.