When a comment is made on a task, an email is sent to the person assigned the task. If he is the one making the comment, then his communication is being missed by the person who assigned the task in the first place. In other words, the comment notification only goes one way. What if the assignee needs to ask a question or get clarification?
I think the comment notification should go to both the assignor and the assignee at a minimum, or even better just go to the person who didn't make the comment.
Am I missing something here? Some setting somewhere?