Rolf Degen summarizing... Borderline personality disorder has become a kind of fetish diagnosis in the world of psychotherapy, but it is as intangible as a soap bubble

Gutiérrez, F., Aluja, A., Ruiz Rodríguez, J., Peri, J. M., Gárriz, M., Garcia, L. F., Sorrel, M. A., Sureda, B., Vall, G., Ferrer, M., & Calvo, N. (2022). Borderline, where are you? A psychometric approach to the personality domains in the International Classification of Diseases, 11th Revision (ICD-11). Personality Disorders: Theory, Research, and Treatment, Jul 2022. https://doi.org/10.1037/per0000592

Abstract: The inclusion of the borderline pattern in the International Classification of Diseases, 11th Revision (ICD-11) dimensional classification of personality disorders (PDs) has caused controversy. Unease about leaving out these clinically challenging patients seems to conflict with the need of an evidence-based and credible diagnostic system. However, the accommodation of borderline within the new diagnostic system has not yet been studied in depth. To this end, we examine in a sample of 1799 general population and clinical subjects the joint structure of the five initial ICD-11 domains and the borderline pattern. Regression and item-level factor analyses reveal that borderline criteria do not form a separate construct and are indissociable from negative affectivity. Furthermore, borderline adds nothing to the remaining domains when it comes to predict PD severity. The borderline pattern appears as largely superfluous and even misguiding, unless their criteria are properly integrated within the structure of personality pathology.