The argument that transition cures gender disphoria is still a dubious one. There's little long term data and much of it still seems to indicate suicide rates wildly high as more or less equivalent with pretransition numbers. It does seem like transitioning has an immediate negative effect on suicide rates in the short term but I'd argue that's because the person has been given hope of a cure rather than an actual cure being available.

The main issues I have with it all come from the medical industries profit motives. If we were simply talking about someone deciding to wear a dress and use a female name with no hormonal or surgical interventions it would be a very different argument.

The main issues are that people who are clearly struggling with very serious mental health issues are essentially sold a treatment that claims it will allow them to become the opposite sex, which is not at all true, and they are also not in a mental state to be able to truly consent to what the treatment involved much of the time.

The argument needs to be focused less on "should it be allowed" and rather "are there better options" currently medical transition is lauded as the best treatment because it is the best treatment for medical industry profit margins producing a life time customer.