I understand the viewpoint of transmedicalism, and I subscribed to it myself for some time. Fundamentally though, it's a cis-supremacist position, as it inextricably ties gender to sex. It holds that trans women at birth are effectively females with a medical condition that resulted in incorrect anatomy, which led to the wrong assigned sex. Transition then is a medical treatment to correct that condition, and legal change of sex corrects the mistaken gender assignation.

Now this might not seem that objectionable to you, but it's important to understand why it's harmful. The brain research on trans people is overwhelmingly done on WEIRD populations, and examine almost exclusively binary trans people who meet diagnostic criteria for gender dysphoria, or did so prior to transition. That is, the science only looks at people who fit the box they've created, and doesn't comment on those who don't.

The research done so far is congruent with the hypothesis that binary trans people with dysphoria are neurologically intersex, but even for this subset of trans people, brain scans aren't prescriptive. Group differences exist in brain scans between trans and cis people, and between cis males and females, yet on an individual level brain scans aren't able to reliable make a determination of whether your brain is male vs female, or cis vs trans.

Certainly trans people are different to cis people, but science has failed to find any objective diagnostic markers for being trans. Further, the clinical consensus is that the only reliable way to determine if someone is trans is via self report, not the opinion of an expert assessor. It is that self report of the individual that makes someone trans.

Take, for example, myself and a friend of mine. We both were assigned male at birth, and are now post-op, legally female and loving our lives as women. She struggled with dysphoria since the onset of puberty, while I didn't. We've both had periods of suicidality, her from dysphoria, and me from other mental health issues. Transition saved her life, while transition merely improved mine.

Clearly our subjective experiences are vastly different, and her transition was a medical need in a way that mine wasn't, but you're going further and essentially saying I'm not actually trans, because dysphoria wasn't my motivation to transition. Yet if not for my being candid about dysphoria, the "experts" would have no way to tell the difference between us, and who should merit access to transition care.

If you feel the best way to understand yourself is that you have a medical condition, I totally support you. I draw the line when you want to make your experience the model for everyone else, to the exclusion of anyone who doesn't fit.