The problem
Personas are supposed to ground product decisions in a real user's reality. A persona built from actual research, interview quotes, behavioral data, observed workflows, is worth having. A persona built from assumptions and stock photos is decoration.
The problem with most persona documentation isn't the research, it's the format. Persona docs in Notion or Confluence become static pages that get viewed on week one and never again. They're usually formatted like marketing copy, padded with demographic details that don't affect product decisions and light on the behavioral specifics that do.
A persona built on a whiteboard, where the team is forced to write only what they know and what matters, is usually more honest and more useful than one written in a template. The whiteboard forces compression. You can't write three paragraphs about the persona's morning routine when you only have half a column to work with.