One of the greatest benefits of IFS, I suggest, is its ability to see value in "parts" as a concrete metaphor for different aspects/qualities/characteristics of the Self which are otherwise referred to in abstract concept terms such as mindsets, cognitions, perceptions, ego, attachments, defense mechanisms, coping strategies, unconscious trauma-related emotional distress, dissociation, thought disorder, identity disorder, etc.

As such, understanding the SELF as a mixture of "parts" implies that some of those parts are (can be) healthy and powerful enough to confront and diminish the adverse effects of the emotionally and behaviorally maladaptive parts; e.g., "My strong healthy parts can deal effectively with my harmful/hurtful parts."

This enables people to view what's happening to them more objectively, less fearfully, and with a sense of agency (internal locus of control). This increases the likelihood that they can then rationally examine the broken/destructive parts and repair them through cognitive and behavioral modifications, appropriate grieving and acceptance, etc.