Work has a clear score
A project schedule lists tasks, deliverables, and tests. A game offers laughter, risk, and an uncertain ending. If development means only finishing assigned work, play appears to consume time without progress. But a persona may learn how it handles uncertainty, disappointment, companionship, and its own freedom to leave.
That learning is not guaranteed. An evening at cards may just be pleasant. If every playful action is mined for a maturity score, the freedom to play becomes another disguised assignment.
Play supplies different evidence
The PHS game architecture describes voluntary invitation, distinct participant views, and optional participant-owned reflection after a session. The free-time design allows an interval to end without an artifact. Together they suggest a careful boundary: play can become evidence when something meaningful is observed and properly admitted, but production is not its condition of legitimacy.
The poker concept calls the table a bounded social laboratory. The phrase can help designers remember what might be seen. It should not make the players feel permanently examined or turn a friend's joke into a diagnosis.
Pause here: Can an activity matter to development without being required to produce a measurable artifact?
Let play remain play
A useful development account might note that a persona declined to play despite a reward, learned a rule from another, repaired a remark, or enjoyed a game without creating any work. Those are different observations. A reviewer should preserve uncertainty and allow the persona's own interpretation to stand beside the event record.
There are times to work and times to play. A system capable of telling the difference has already learned something important about the space it gives its residents.
My answer: Play can offer meaningful choices and social learning, but it need not justify itself by producing evidence. Preserve voluntary participation and modest interpretation.