[starry]

The tasks tend to be very obvious. And really the people who decide whether a task is successful or not are the producers and normally they want to say they are successful anyway. Sometimes they even give HMs several opportunities to pass the task.

A secret mission is actually of huge benefit to the HM that gets it as all in the house surely know. It gives them airtime and it gives them the sympathy of the audience who feel only they and the HM know about what is happening.