This may be true but there are so many gender identities and pronouns now that it has become absurd. To keep things simple, I tend to refer to people by their assumed biological sex if it is obvious, not their gender identity which would have to be guessed at anyway.

Given that this is a medical condition, it raises all sorts of questions as the the appropriate treatment that haven't really been dealt with. Is this a condition we should try to test for, detect and treat in different ways at an earlier age, or is assuming a different gender identity and possibly having a sex change operation really the best or only route? How do non-binary gender identities fit into this explanation?

You are biologically a man or a woman based on your chromosomes. Identifying as something different doesn't change that. Don't get me wrong, you should be able to do whatever you want with your own body. I just think the Nazi like attitude that you have to refer to somebody by whatever made up gender they choose or you are a sexist, homophobic bigot has gotten a little out of hand in some cases.