User blog comment:MisterWoodhouse/Profile and Message Wall on the Unified Community Platform/@comment-1807002-20200305184713/@comment-1807002-20200305193317

"Unfortunately, since the new Message Wall is based on Feeds, it will not be supporting wikitext. This was a very difficult decision for us to make, but in the end, we saw that a very small percentage of messages were making use of the old Message Wall’s source editor."

That percentage was probably mostly admins and since wikis don't exactly have more admins that users; this is hurting mostly the admin population who use these tools to run a wiki.

All though admins tend to endure, that is why they are where they are- this could result in less patience and more dismissive admin behavior since their job will be made harder. But I am sure we'll all be crutching cheat sheet notepad files to copy paste- waiting for an upgrade to the lateral message wall upgrade.