I find your question very intriguing, Maze. I could probably write a long essay on this topic bringing in biology, animal sciences, medicine, psychology, chemistry, etc... However, I will try to keep my response short. Knowing me, it will include more questions than answers.
In theory it is a strength of humans (and mammals in general) to be able to feel strong emotions and then use intelligence to explore our options and make plans. In contrast to most animals, we humans are born extremely helpless and immature. That is when our parents come into play and first teach us about our feelings, needs, wants, and desires (and how to control them) with love and limits. If we don't have the loving parents who also set limits, that sets us up for problems. Any additional trauma before, during, or after growing up can make it difficult to feel or control emotions.
In the case of trauma, our emotions may be pulled to extremes. That is why we (similar to animals) have reflexive coping skills: fight, flight, freeze, or fawn. We, humans, if we cannot physically fight or flee, we often freeze. Freezing is particularly damaging because our own "healing" from trauma is interrupted. That interruption can affect us long term. We are more likely to keep reliving our traumas. Every new trauma is likely to have us respond similarly (i.e. a freeze response). According to Peter Levine in "Waking a Tiger", animals in the wild learn to complete the entire cycle by shaking once they have survived a trauma. In the therapy style, Levine proposes, we need to go back to what we physically felt at the time of trauma and then follow our bodies to get that frozen feeling out of us.
As I am only a year into the treatment, I cannot speak to any long-term effects of the therapy for myself yet. However, it is a gentle approach to access the traumas and then talk about them, use sand or play to out the traumas, or at least allow my body to physically defend myself against my abuser.