Board Thread:Support Requests - Getting Technical/@comment-14779707-20131219084026/@comment-11733175-20131220105042

Monobook is supported to a point, but it does not have all the features of Oasis. These are primarily special pages that come with wikia developed extensions, such as Chat, CSS, ThemeDesigner and so on.

Monobook is supported for pretty much every other feature, such as article comments, blogs and wall forum. Essentially anything that should be visible to all users all the time. Wikia do actively fix bugs in monobook, if only to fix the bugs they inadvertently created such as when they unintentionally modified search in both oasis and monobook (it was meant to be just oasis).

All other skins, which may or may not be accessible through useskin, are not supported. The exception might be uncyclopedia, but that's vector by another name and supported by wikimedia. All other skins bundled with mediawiki do not receive bug fixes or updates and aren't available as skin in Special:Preferences. Skins like wowwiki and lostbook probably get the same treatment as monobook when it comes to new features, but I believe they are maintained by their respective wikis.