@feditips What's a big UX problem: You can turn a regular reply into a direct message.

I was posting something and got a reply on that post.
Researched for some time and wrote a reply to it.
A few days later I clicked on "Direct messages" and only then realized that my own reply wasn't seen by anyone else because I replied to a post with the post privacy "Mentioned people only".

I though I made a well researched public post. Instead it was wasted time.