Our taxonomies for personality traits and human grouping is quite primitive. Our ability to categorise people in useful ways is really atrocious. So often we force that category on people, because that's easier then improving our categorization.

Hopefully, this improves in the future, starting with medicine amd nutrition, there's more discourse happening about the individual characteristics. But I'm afraid its a hard problem, accurate genes and gut microbiome measurements could maybe improve things. But then correlating these with behaviourial traits and emotional well being is incredibly hard.