There are a number of Pull Request settings already to manage various requirements in order to merge a PR, but there is not a setting to control whether or not a PR can be merged if it is flagged as "Needs Work"

The description that's displayed if you hover over the "Needs Work" button says "Needs Work. This pull request shouldn't be merged yet", but there is no setting to actually enforce this behavior.

It would be great if this option was added to the standard Pull Request settings.