It’s defined by the ICD and DSM. If it were too broad, it would be unknowable to us at this point without some major new discovery that changes the definition. Having said that, there aren’t really enough psych resources to go around so a lot of people are walking around undiagnosed but with very obvious symptoms. I don’t think this is bandwagoning. I think it’s people behaving rationally in response to the limitations of a relatively new and growing branch of medicine. Regardless, I’m happy to see people starting to acknowledge and accept a broader diversity of psychological states. I feel like it at least helps people get treatment, if they want it, by reducing the stigma around mental health diagnoses.