Kuhn says that it's good for a paradigm to leave a number of unsolved problems.

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Kuhn argues that a paradigm needs to leave some problems unsolved in order to maintain its stability and provide opportunities for future scientific research and discovery. If all problems were solved, the paradigm would become redundant and there would be no incentive for researchers to continue working within that framework. Therefore, leaving some problems unsolved is beneficial for the advancement of science within a particular paradigm.

Kuhn Says That It's Good for a Paradigm to Leave