They are challenging WPATH and I'm not going to take that away from them.
But Genspect is to an extent the same model as WPATH which is the issue.
There hasn't been any other area of healthcare that has a body like WPATH for good reason; it's based on ideas.
Other professional medical bodies are made up of medical professionals. From what I understand, you may have charities which work separately, under those bodies, who may lobby / raise awareness of the issues. They may have contact with families but they don't treat. They'll sign post but to the medical evidence set out by the professional body, who are trained to focus on what is the current evidence and best practice.
WPATH had some medical professionals who were very biased and some who weren't more than extremely ideologically driven parents of kids. You've now got some of those parents doing phds in order to generate papers for WPATH to refer to. (Eg Cal Horton.) WPATH clearly generates its own evidence base. (Cant remember the term.)
At the very least Genspect is drawing from the sparse but growing evidence that opposes WPATH but as said countless times on this thread, when dealing with children and health, safeguarding must be the priority. They're trying to do too many things.
Cass was significant as it was independent.
Safeguarding isn't ideologically driven. It's based on evidence of harm.