The point that you have brought up is a core issue. There are valid reasons why the society is interested in the number of field service hours and literature placed. These reasons include measuring the effectiveness of the activity and determining production levels of literature. In this case the society would be better off to allow anonymous reporting because this is the only way to get full honesty.
However these valid reasons go away when the society uses "turning in your time" as a coercive tool to manage the r&f. As a coercive tool the society has created a whole culture where the r&f learn to manage their time to keep the elders off their back.