Provide the output of the last comment in the task as a separate field of the report / list.
If several people work in a task, then to see if there was an answer to your comment, you have to go into the task and check. With a large number of tasks, this is inconvenient.

Some statuses of tasks, for example, «Task stopped», should block the possibility of logging time. To do this, it is proposed to indicate in the settings of a specific status whether it is possible to logging time. Unlike the current situation, when only the general «Allow logging time on closed tasks» setting is available.