Board Thread:General Discussion/@comment-22224-20180521161500/@comment-25356303-20180526224233

The technical reasons for the change were alluded to in the comments linked at the bottom of the original post (1, 2, 3). Wikia could have continued supporting both Oasis and Monobook but the cost to do this was deemed too high due to the systems/procedures used to comply with GDPR.