Quite often people do not listen or seek to hear from their play-testers. They watch how they attempt to solve the puzzles and otherwise play the game. The devs

Quite often people do not listen or seek to hear from their play-testers. They watch how they attempt to solve the puzzles and otherwise play the game. The devs ask specific questions about how the player approached the situation. The idea that the 'untrained eye' of the random playtester gets to make creative decisions about the game overall.. simply because they showed up to playtest the game, is a bit much. Often programmers and artists don't even get full creative control over the work they do at game studios, random playtesters are far from ruining Michelangelo's David. Michelangelo is not even in full control, the techniques he learnt, skills he obtained and decisions he made earlier in the work, limit his sculpture too. There is a way to integrate playtesters without demoting Michelangelo from control over the work.