Being gay has no negative consequences and when homosexuals are left to live how they want, they are happy and overall have no problems. Also, this identity doesn't change much during their lives.
In comparison with that, people who are delusional, are not feeling any better when they recognize their delusion. And it might actually be dangerous to affirm them in their delusion.
People with GID are somewhere on a spectrum between homosexuals and delusional people. Even the most affirming countries are clearly not enough. They still have a very high suicide rate. Plenty of them detransition, especially kids. There is statistically significant prevalence of mental disorders. 58% of people with GID have at least one psychiatric diagnosis (source https://pmc.ncbi.nlm.nih.gov/articles/PMC6830528/).
Personally, I think that society is accepting gays for a good reason and not affirming people with GID for a good reason, too. It's not bigotry, it's a recognition of reality.