Chat Threads
This is one thing I miss from Slack, which is the possibility of organizing messages in threads (see image). Discord supports this as well, though only in channels and not in DMs/Group chats.
This helps keep communication organized by keeping messages related to one particular topic (for example, discussing a particular bug) separate from others. I think this might be particularly beneficial to Status since messages sometimes do not arrive in order or they take a while to arrive, which introduces additional noise in the communication.