I think the authors of the “study” may be missing the point.
People can reach a similar state of the their mental health, while having taken different paths getting there, including some with and some without traumatic events along the way. Their causes need not be the same, and yes, some diagnosis can have SOME similar symptoms with other diagnosis - just as is true in many biological medical issues.
That does not mean that a similar mental status they have obtained is wrong or “meaningless” just because the specific causes for it in each of their lives differs.
Also psychology and psychiatry do NOT presuppose that treatment for a particular mental state must or will follow exactly the same path for each individual or that that path will or ought to ignore the unique path the individual took in getting there. The authors seem to either ignore that or don’t understand it.
I am not really clear on what the motives of the authors of the “study are”, but I do think their conclusions miss the mark.
Prior trauma, especially sexual trauma from trusted adults, in my experience, pay key roles in molding a patients pathologic response to current real or perceived threats.
I have repeatedly seen the same patient variably diagnosed with Schizophrenia, Schizo-affective Disorder, and Bipolar Disorder, from admission to admission. It causes an outside observer to exhibit distrust in the scientific rigorousness of Psychiatric care, and by extension, Psychiatric Literature and Studies
We really need better answers