Fixing a 'Spotify Redesign' Portfolio Piece

A candidate's strongest portfolio piece is a speculative redesign of a popular music streaming app's playlist-creation flow, done as a personal project with no real client, no real users, and no real constraints — just their own opinion of what could look better.

1. Explain specifically why an interviewer is likely to weight this piece less heavily than a messier real project, even if the visual execution is excellent.
2. The candidate can't turn this into a real client project retroactively. Name two concrete things they could add to the same project to make it meaningfully stronger without needing a real client.
3. Explain why a messy real project with a usability test that revealed a wrong assumption is, counterintuitively, a stronger portfolio piece than a polished speculative redesign with no setbacks.