User blog comment:MisterWoodhouse/The first migrations to the Unified Community Platform/@comment-94.2.163.0-20201229200824/@comment-30782076-20201229213553

Besides UCP uses an editor that is native to MediaWiki. The new editor is also used by Wikipedia. The legacy was a mistake, because it was an fork and the fork became bloated. They weren't able to upgrade with the fork.