Drupal empowers site builders and editors to configure their sites in settings forms. Configuration management lets developers push changes up to live sites to be imported. But developers have to be considerate to ensure imports will not wipe out those changes made directly through the live sites' settings forms. At the least, they have to export the changes before making further tweaks. But admins may make further changes in the meantime too, so developers can end up frequently pulling irrelevant changes back from live, which seems unnecessary.
Here's some examples of the kind of config that I'm thinking of: