You are definitely correct, and in fact that’s how diagnoses are made. The reality is that just about every human being has at least one trait of every single known disorder. It is the combination of traits, intransigence of them, and severity of consequences in the life of the person or those around them that adds up to form a disorder. That’s why a slang reference to the diagnostic manual is actually “the book of being human.” But at a certain point a diagnosis can become helpful because of the way our healthcare system works. In day to day life the label is far less useful than simply knowing what to do with such forces in the community.