The counterpoint would be that this happens to millions of people undergoing psychiatric care every day for other reasons. "Better living through chemistry" allows us to treat various conditions, even relatively harmless ones, through alterations in brain chemistry. Brainwashing, as it were. And that's relatively accepted practice today.

I think a lot of people would jump at the opportunity if there was a magic pill that would just suddenly make you feel comfortable in the skin you're in. Gender dysphoria is not a pleasant condition to experience, and the only solution we have available right now is to transition into what feels more comfortable. But it'll likely be a long while (likely not within our lifetimes) that discrimination against trans people will come to an end, so the alternative to dysphoria is social stigmatization that causes other negative medical states anyways.

There's a reason trans people have such a high rate of suicide. If the medical community were to decide that a pill that cures gender dysphoria was a more reliable intervention than living with all of the baggage that comes with being trans, I don't doubt that many/most would prefer that approach.