Users often send multiple messages back-to-back, sending a message as they complete each thought, rather than composing a full message and posting once. This is a natural way many people communicate in chat and IM interfaces. It would be great if the app could combine consecutive messages from one user into a single message visually. There could some invisible timer in the background so if a minute or two passed with no new posts, and the same user posted another message, that would be treated as a separate message.
RC Classic did something like this - see attached screenshot. Each line is a separate post, but my avatar is only shown once and the messages are combined with one timestamp. It makes things much easier to read when someone sends rapid-fire messages.
One improvement over the RC Classic feature - when messages get grouped together, they still have separate actions on the right side (bookmark, pin, edit, etc.). It would be better if these ALSO were combined into a single action menu, so those actions would cover the entire grouping of messages.