@Oncewasblueandyellowtwo I am sorry not to have responded, your question got lost in the avalanches. My thoughts on your question are that young people who present as gender non-conforming could have a wide variety of reasons and related needs. Some might have some kind of body dysphoria. Others might just be gender non-conforming.
Incidentally, this is one reason why I think the idea of gender is useful. In a utopia perhaps we wouldn't have sex roles, but we don't live in a utopia. Until we do, we still need words to explain how people are non-conforming within hegemonic frameworks like heteronormativity. You could say gender non-conforming is sex-role non-conforming, maybe? But that limits the discussion to roles or activities. Maybe gender encompasses this but also includes the way someone feels inside.
I know people don't like this idea and mock it as some kind of woo spirit idea. But there are lots of precedents for talking about how people feel inside, eg imposter syndrome, 'more Bengali than British'; 'more British than Bengali', 'not a proper mother', depersonalisation, depression, religious faith, etc
On the questions about Jazz Jennings and surgery:
What is happening to her sounds horrible. I feel very uncomfortable with the idea of creating a neo-vagina at all. Bottom surgery is not satisfactory for a lot of trans men, either. The whole thing is driven by heteronormative ideals. In a non-gendered utopia this might not even arise. But we don't currently live in a non-gendered utopia.
Some bottom surgery goes really well and leaves people feeling very happy. Others go badly and lead to a lot of pain. Many people are happy with breasts/chest surgery that helps them to pass as one sex or another with clothes on, but are reluctant to go for bottom surgery because of the unsatisfactory nature of it- in terms of function and pain.
What we need are options for people- not gender conforming ones, necessarily, but options, and good clinical discussions with well trained clinicians that transcend the idea of specifically gendered bodies. These high quality clinical discussions need to be available to people on a case by case basis. A nonconforming body might be the result, for some. The idea of a trans person who ends up after treatment with a body that doesn't fully conform to binary ideas of sex might feel very uncomfortable to some people, but it's not your body, is it?
And this is another reason why I think gender rather than sex is a useful concept. I think gender allows for some variation in bodies, feelings and presentations.
Anyway: the sheer range of provenance, feelings and clinical needs of trans people means that there will always be some who need some kind of treatment, whether that's surgical, medical, or psychological. How we determine who these people are and exactly what their needs are is something that happens in collaboration with clinicians and ideally with families, for young people. The kid's contexts and environment needs to be assessed and supported. This might mean things like having access to safe toilet facilities, for example, or protection from bullying and isolation. Some will need treatment and some won't. Whether or not ROGD is really a thing is kind of irrelevant to this fact. All of these people need some kind of support.