The question in the title was asked in Quora.
Mike Donahue wrote a nice answer, most of which I agree with:
“Building on what Jakob Persson has said, it’s not even just a matter the right reason to use personas. You also need to know if the persona you use is worth using.
- Is it built using accurate, unbiased research methods
- Does it contain actionable details, and as Jakob points out, those are behavior details. It’s rare that demographic details provide significant insight into how to shape the experience.