Most production problems are communication problems. Comments put the conversation on the task it is about, where the next person will see it.
Comment on the Task
Questions and instructions attach to the task itself, so the answer is where the work is rather than in someone’s messages.
Know It Was Read
Comments carry a read status, so you know whether the instruction landed before the item goes out.
One Inbox in the App
An in-app inbox collects what needs your attention, with a toast when something new arrives.