Web pages can get very long, especially in areas such as reporting or documentation. Sometimes, dividing long pages into subpages improves the readability, but it may also be counterproductive, e.g. with API documentation articles whose readers don’t want to jump back and forth to find the pieces of information they need.
To improve the usability of long pages, the first thing that comes to mind is anchor navigations. Such link lists at the top of a page (or wherever appropriate) enable readers to obtain an overview of the page contents and navigate to any of the sections starting with a headline. As an editor, you don’t want to build and maintain such navigations manually, do you?