User blog comment:MisterWoodhouse/The first migrations to the Unified Community Platform/@comment-12180476-20201109105005/@comment-1038387-20201123163923

References and Tabber did not change, though the cite extension did get some fancy new tracking categories. Switches? The ParserFunction #switch? Still works. ReferencePopups needed to be changed for UCP, but that was done, and Tabview is retired. Tabber is not recommended, but that's another story. Fandom can't account for every wiki's custom coding.

Everyone in their right mind implements an incomplete product. It's called Minimum viable product. Nothing is ever complete. Wikis, by nature, are published as an incomplete product.