Problem/Motivation When Drupal integrated CKEditor 4 into Core it was the best available solution at that moment in time. Since then the editor landscape has shifted dramatically. Therefore we - as a Community - need to select a new editor for Drupal 9, so that we can deprecate CKEditor 4. We (at Tag1) recently did a larger survey of available editors in the space and there is more than just CKEditor 5. As there is no upgrade path for CKEditor 4 to 5, there is no reason that we need to just update to the next version.