User blog comment:MisterWoodhouse/The first migrations to the Unified Community Platform/@comment-45171933-20201202174358/@comment-1038387-20201202201456

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Gamepedia was on mostly current MediaWiki, I believe 1.31? Fandom was on heavily forked 1.19, 8 years out of date. If you want to suggest moving Gamepedia to that, I'll open up a pitchfork and torch store. If you want a say, you have to know what you're talking about.

Wikipedia is NOT sticking to an older version; I don't see how you can get that impression. MediaWiki exists primarily for them; they're the major stakeholder, and they're on MW1.36, as of last month. However, Wikipedia uses the vanilla version and Fandom has to implement a lot of changes.