If you look at the attached PDF, you'll see with the blue arrow that I'm able to reply to an original posting. I'm unable to reply in a threaded way to a reply to that original posting. What would be useful, I think, would be a reply button available on every internal reply (see green arrow). If I respond to a student's reply, for instance, I have to do so on the main post, and if a number of students have replied, then my reply ends up at the bottom of a list and the context of it isn't necessarily readily apparent.
reply buttons.pdf