I understand your perspective - in a different world without ethical qualms or risk of harm we could conduct those studies and maybe have better, more conclusive answers. What I am suggesting is that we have the data and research that we have. While you have chosen to draw a line at requiring randomized controlled trials to convince you that a certain outcome is the right one, there is an abundance of research and clinical data that does exist endorsing affirmation of gender identity, and we can explore some of it, if you like.
> In all other cases, if someone's mental conception of themselves was not aligned with the biological reality of their self, we would say the default is that the person should try to adjust their mental conception.
Can you elaborate on what you mean by "other cases" that are directly comparable with gender dysphoria, and can you find some studies that support the effectiveness of this approach? Gender dysphoria seems pretty unique from a clinical perspective despite a common thread it may have with other conditions.
> I do not have a gender identity and I do not have a gender. I a sex and I have an identity as a sexed being.
I think it's great that you are very clear on your role in society when it comes to what side of the biological sex binary you are on. It's a luxury to not have to be concerned with it, but not everyone has that luxury.
> It's actually really difficult for me to understand how a person's fundamental well-being is intrinsically and immalleably tied to names and clothing.
What you are saying here is that "this is my experience and I do not understand why everyone else does not have the same experience". Do you not see a problem with that? You can have your opinion and that's fine. Other people do not have to share your opinion or approach the world in the same way.
You appear to start from your biology and work backwards, as if the mind does not exist. Others would suggest that you and your biology do not even exist without the conscious mind making them real. Thus, the power of the conscious mind is actually more critical to this whole equation than whatever your biology is.
Stop thinking about your own experience for 5 minutes and think about the experiences of other people and where they might be coming from based on their own perception, experience and biological realities - including the biology of what goes on in the brain!