Board Thread:Official Announcements/@comment-4079189-20191021194503/@comment-4079189-20191022195332

Yes, whatever the replacement is for Message Walls will allow similar functionality.

From the blog post: "We understand the need for user-to-user communication in the way that Message Wall facilitates, and we will have a replacement in place on the UCP. We will be transitioning your Message Wall content to the replacement."