I think what they are saying is that the patterns are so pervasive that it becomes part of the individual's personality. But I think most agree that personality disorders are mostly related to unmet needs or developmental milestones in childhood. And it would make sense that going back and filling in those holes would be the way to get better.

Ironically, "adjustment disorder" refers to temporary symptoms related to something goin gon currently in the environment. Anything more than six months and it becomes another disorder, not adjustment disorder. Insurance companies usually won't cover adjustment disorders because they assume that they are short-duration and not serious enough to necessarily require treatment. Insurance companies usually won't cover personality disorders because they are considered long-term and too difficult to treat effectively.