Psychology is both a social science and a medical science. To the extent that mental health care is part of health care, its practitioners have certain obligations to do no harm, and to provide a service that helps its patients.

And it is for this reason that your defense of the APA's approach, such as it is, is not terribly compelling. Of course the APA does have to evolve, as does psychology. And given how absurdly much of psychological "knowledge" was built from very non-diverse cultures, ages, sexes, ethnicities, you name it, we shouldn't be surprised that it might have to change a lot.

However, the way to do this, while it is to increase diversity (in many ways--not just racial!), is not to just blow along with the winds of culture or the fad of the day. It is rather to embrace the complexity of humanity and try to learn.

Henriques' charge against the APA is that they are not trying to learn. They have adopted a mindset, according to him, for which there is scant to no evidence. You provide no indication that he is wrong on those counts.

Change can be less painful when we listen to those who warn when it's on track to cause more pain than necessary.

So I think it's pretty important to try to judge whether Henriques is complaining about necessary change, or is warning us about unnecessary pain.