A team is developing an automated system to find the best prompt for a language model that generates creative story plots. They define the set of all possible prompts the system can test using a strict template: 'Write a story about a [CHARACTER] who wants to [GOAL] but faces the obstacle of [OBSTACLE].' The system can only replace the bracketed placeholders with words from predefined lists, each containing 20 options (20 characters, 20 goals, 20 obstacles).

Critically evaluate this method of defining the boundaries for the prompt search. What is a major strength and a major weakness of this approach for the specific task of fostering creativity?