User blog comment:Susanolivia/Fixed Width, Sidebar, and the Removal of Monaco/@comment-75.71.39.16-20101001171603/@comment-1689515-20101001172322

Monobook isn't officially supported by Wikia, though. FFWiki has it as an option, but the staff there can't set it as the default for that reason. Yeah, certain wikis use it, but those wikis are special exceptions and have been for a while because of their structure.