If a file is renamed for some reason, all the links to this file will suddenly fail or "break." This would give a web visitor the infamous UNIX 404 or "file not found" error messages. If a file is moved to a different directory or folder, the same issue arises: all the hyperlinks to this file must be adjusted accordingly. It is very easy to overlook one...

Authoring environments, with their built-in file and folder screens, warn of renaming and moving actions and the possible damage. Good tools can adjust the links for you automatically.

Sophisticated authoring tools offer global search and replace commands making site-wide edits simple, e.g. if someone's email address changes.