I have using repeating task for creating monthly reports, and needs that assigner add comment and attach file only to current task.
But if he adds comment, this commend adds to all future repeating tasks.
He can close the task (after closing, opengoo duplicates repeating task for futute with new id, and current task stay with old id), reopen it and post the comment.
But it is uncomfortable and not intuitive for users, much better to add the button "detach this task from repeating" for do this.