User blog comment:MisterWoodhouse/Profile and Message Wall on the Unified Community Platform/@comment-26978548-20200306010501/@comment-24171918-20200306011201

"Communities will still have the option to use User Talk Pages instead of Message Wall, should the admins decide to go that route."

Yes, they will remain.

Please take your time to read the blog or the comments, this exact question has now been asked for like the 7th time or so...