To be fair to the authors, this is not the only argument in their paper. Their basic point is that personality disturbance is a spectrum: rather than it being a black-and-white question of “normal” vs.”PD”, there are degrees, ranging from “simple PD” which is associated with a moderate degree of life crap, up to “complex PD” which has much more and “severe PD” which is worst of all.
That’s all fine, as long as it doesn’t lead to pathologizing 78% of the population - but this is exactly what it might do. The authors do admit that “the SCID screen for personality disorder, like almost all screening instruments, overdiagnoses personality pathology”, but provide little assurance that a “spectrum” approach won’t do the same thing.
As diagnostic criteria adjusts to the DSM-5, I’m sure we will see spikes in some disorders (as well as the formation of completely new ones) and more of this broad spectrum concept developing in others. I suppose it’s the hope better tools will be developed/tweaked to match the adjusting criteria for more accurate diagnosing and effective treatments. Ummm hmm.