WordPress has done a good job of taking the top ideas and incorporating them quickly into its CMS. Many times not right away, but under the hood they are there

WordPress has done a good job of taking the top ideas and incorporating them quickly into its CMS. Many times not right away, but under the hood they are there and they can easily built a UI for it later. They got a lot of ideas from Drupal, Tumbler, SquareSpace, Ghost, Headless CMSes, etc.