Is dissociation both a defense system and a lack of learned skills of association?

Most things I read about dissociation is about how it is/can become a maladaptive coping strategy and later a defense system to handle trauma (or possibly everyday stressors, e.g. boredom or feelings of powerlessness).

But dissociation is so much more – as is its counterpart association. So how do we understand “normal dissociation”? How do we understand how maladaptive dissociation emerges and becomes a pattern of coping (outside the range of “normality”)?