User blog comment:Dopp/Technical Update: March 13, 2012/@comment-4578246-20120313184525/@comment-1656630-20120314172117

Hi Rappy! Monobook is left for those advanced users who prefer a simpler and less visual skin. We've always been clear that we won't be adding new features to it (unless there's a specific reason to make an exception) -- it's an "as is" skin, and kept as a courtesy to some of our oldest users. We focus our development efforts on our primary skin, with an aim to keep Monobook in its original, stable condition whenever possible.