User blog comment:MisterWoodhouse/Profile and Message Wall on the Unified Community Platform/@comment-39615110-20200305203703/@comment-24006128-20200305203901

The old Message Walls have wikitext because they're built into MediaWiki, a solution which holds back ease of MediaWiki upgrading. Our research into usage of the tool found that it was not a critical need. We're looking into areas of advanced usage where Feeds tech can be improved, but wikitext as a prescriptive solution is not seen as a smart choice.

As for wiki editor identity, I think you're going to love the new editor we're deploying with the UCP.