Throughout the history of psychopathology, there has been a long debate about whether mental disorders should be classified categorically or dimensionally. This issue is particularly evident in the classification of personality disorders. Categorical systems have a long tradition and have been supported by psychiatrists and clinical practitioners. With the development of sophisticated statistical methods, psychologists took over the field and provided studies advocating a dimensional system of personality disorders. Driven by research findings from academic science, the classification system gradually evolved from a categorical approach in form of distinct disorder types in DSM-III (1980), to a “hybrid model” with categorical and dimensional elements in DSM-5 (2013), and most recently to a dimensional system in ICD-11 (2022).