This came up on the Fediverse: @firstname.lastname@example.org wanted to automatically add titles to the posts on his microblog.
This automation would have to be compatible with all the editors, including the mobile app.
I think may be a fairly common request when one uses their WordPress site as microblogging platform. When you share quick updates with your friends, be it a picture, a video, a sentence or two, you don’t really want to have to think of a title for that update. The editor should enable you to share, not get in the way.