User blog comment:Susanolivia/Fixed Width, Sidebar, and the Removal of Monaco/@comment-2107880-20101022063904/@comment-1025281-20101022101211

That's definitely not the reason Wikia gave for making a new skin - it's not suggested on any Wikia-released material. They merely said that accessibility improvements for the disabled were one of the things they integrated into the new look. I'd like to add that any skin has bugs. Monaco, believe me, had its fair share of the bugs. How quickly bugs are squished is far more important than whether the design has bugs at all.