There's not been any meaningful revelations about antidepressants that should be having any influence on whether they're prescribed. It's an academic discussion about mechanism of action. Questions of efficacy are separate. Personally I don't think SSRIs are particularly effective, and they're prescribed mainly because they're pretty safe, the placebo effect is real and important, and you never know, they might help a bit on top of that. But that's nothing to do with the research into MOA.
Aspects of your argument help the people who want to cut, cut and cut mental health services for children, young people and adults. There will always be some people who need specialist mental health care no matter how much we improve society because mental illness exists, is real, and can't always be avoided. We need to tackle poverty, abuse, racism, unhelpful societal trends, and other things that can trigger or exacerbate mental health problems and mental illness, but we also need well-funded mental health services for those who are mentally ill.
If these new regional hubs will help young people questioning their gender by tackling issues around ASD, child abuse, OCD, and so on as well as their gender issues, that's great, but what about those children who have all the same issues but haven't said the magic g-word — are they going to be left to struggle along while the special ones get swept off to a luxury holistic service?