Of course they do, because they are organisations which operate under the tenets of trans ideology; in the same way that if you asked a religious organisation for a view on something it might well frame the responses acording to, or within, a particular religious framweork.
WPATH , for one, has some quite shady origins in its founding members, and even some of its own findings have long been discredited.
It also promotes and links to some very unsavoury peccadilloes and fetish websites. For example, a few years ago it added a new 'gender identity' to its list of possible gender identities; that of 'Eunuch' and we were told that children as young as three could develop 'a Eunuch identity'.
This section then actually linked to a very concerning websit in which men fantasised about castrating boys, and to a whole dark world in which men pay to watch other men be castrated or have their genitalia removed.
Another example is of the previous U.S secretary for health, who was a trans identified man, Dr Rachel Levine. He commissioned a study by John Hopkins University into child gender transition. The findings were not favourable to the ideology or desired outcome and so he suppressed these findings, and continued to promote then transitioning of children. He wanted no lower age limit at all.
On the contrary, there continue to be studies done, worldwide, which show no consistent or great positive mental health benefit to 'transitioning', and also show a negative impact of puberty blocker use that have led to the withdrawal of such treatments in various countries.Some studies show worsening mental health outcomes and suicide rates after transitioning, once the initial euphoria does down.
And of course you only have to listen to the stories and accounts of detransitioners to understand how the ideology operates and how transitioning doesn't always resolve dysphoria.