I've been following this concept and the campaign for its inclusion into the DSM, though I'm not qualified as a psychologist (just a therapist). I feel it's VERY useful and may be more accurate than giving some people a personality disorder or BPD too quickly. In fact because I chose to work with younger people and trauma, tbh I've been looking at everything in my work through a developmental trauma lens. And it makes rapport and trust building the core of my work, no matter what age or neurotype the client is. Then I pull in different tools as needed depending on what may be helpful to my client, and they always have a sense of choice, direction, and possibility. A lot of it will go back to what they want and how to work with the brain and nervous system that they have. As for the question of DTD vs CPTSD, I feel the distinction is very little. When you have young people growing up in dysfunctional systems, constantly being impacted, I think it's CPTSD in the old or ICD paradigm, but it's DTD because of their ages. I don't know if I can think of many individuals (if at all) who only experienced CPTSD after maturation, even though it is technically possible. Thank you for the thought-provoking questions!