User blog comment:MisterWoodhouse/Social Activity, the 2010 Editor, and Unpausing Migrations/@comment-26843482-20201012202739/@comment-25358237-20201012204700

Fandom is under no obligation to leave your wiki on legacy, as they own the platform and can do as they wish. If they don't want their site to remain on a severely outdated version of MediaWiki, then they have the right to change this.