CPTSD has been around for 20 years... its not new. It was around at the time of the DSM III and applied for inclusion the the DSM IV, then DSM IV-TR, now also the DSM V, rejected from all three. The first two due to inconclusive data. The current doctrine because empirical data is now consolidated to say the CPTSD theory is incorrect, because a majority of trauma sufferers who endure the specifics involved don't equally fit the proposed criterion.
People should not get wrapped up in CPTSD... this site is about the truth, and the truth is that CPTSD as a diagnosis has been rejected conclusively now. There is no diagnostic criterion to be diagnosed with this... labelled, yes, diagnosed, no.
The facts as they stand now, the APA are looking at including DESNOS, which will become the diagnosis for those fitting complex trauma.
I wouldn't say all trauma is complex though... that is wrong. That is an emotional approach, not a factual approach. You can say that to be "emotionally" supportive, but that is just not factual.
CPTSD is no different to other terms already used, such as Secondary PTSD, Combat PTSD, etc... none of which are diagnoses, they are purely terms. None of them have clinical significance other than a term used to quickly identify specific actual diagnoses the person has based on trauma type. That is the key word... "trauma type".
CPTSD = PTSD + BPD and/or dissociative disorder.
Combat PTSD = PTSD + substance abuse disorder and/or mood disorder
Secondary PTSD = PTSD from being traumatized by someone else with PTSD (relationship) due to abuse endure that is in itself, traumatic (physical and/or emotional).
None of the above are diagnoses, they are terms quickly used.
The APA discussed pulling PTSD apart a couple of years ago, into diagnostic categories, and they concluded that it just wasn't in the best interest of the patient, as correct diagnoses already existed. Basically, if its not broken, don't try and fix it.
The beginning DSM's and psychiatry was quite young and within infancy compared to psychiatry today. Whilst it is still evolving, neuroscience has really helped define stability which we're now seeing in the development of the DSM V, through confirming current practices or slightly amending. Very little new is being added to the DSM V overall, more its being refined, as current practices, data and neuroscience has confirmed accuracy for the majority of current psychiatry... which for those within the past decade, is overall good news IMO.
We have traumatic, abnormally traumatic and then complex trauma. There is a very clear and definitive difference between all three types and how they interact with the brain and behaviour in general.