User blog comment:MisterWoodhouse/The first specifics on the Unified Community Platform/@comment-4780559-20191017101343/@comment-214161-20191017200239

There are definitely a lot of different approaches to the comments (Warframe used it, Fallout didn't for example), and communities also made decisions about supplementing it with Discord. But to be honest I think the update to MediaWiki is so important it has to take priority. Hopefully the alternatives won't be too bad but in comparison, but the improved security and performance are too good to give up.

I don't envy whoever's making the official decision on that account, but I also think in the long run it's going to be worth it for all involved across the Fandom communities, even if that means involving alternatives to comments.