User blog comment:MisterWoodhouse/Profile and Message Wall on the Unified Community Platform/@comment-3403151-20200305213842/@comment-24155515-20200306000406

.....Yeeeeeeah, guess I'm thinking of switching off message walls when these updates make it to older wikis, for no other reason than that I really don't wanna have to figure out how to make the block template, which is shorthand for a reason, work as something to paste to the woefully limited Discussions-type editor.

I don't think wiki markup will go away in the editors or an actual mass exodus of the editors that make quality edits will happen. But the amount that I myself use markup (that doesn't work in Discussions) in message walls (as well as the extensive markup used in the welcome template) is enough that I'm willing to court shutting the feature off.