Board Thread:New Features/@comment-44745594-20200814001438/@comment-9605025-20200814165803

Discussions, article comments, blog comments, and message walls on UCP all use the same backend; Feeds. Feeds is a completely separate platform from MediaWiki. MediaWiki is the one that supports wikitext. So no, none of the new discussion features support wikitext and it is likely they never will.