Duress has never been effective in getting students to study.
Punishment and duress are the desperate measures of a dying society. They only produce pain and unconsciousness. At best they produce confusion and fear and distrust of learning.
They don’t increase the abilities of a thetan.
Ethics used on the proper gradient is never duress. It is the exact nudge needed to get the person back on the road he was traveling.
An example would be if a student dopes off you don’t assign him non-existence and make him work up through the conditions. You find out the misunderstood he has and get it cleared up. You then find out why he didn’t find the misunderstood himself when he realized he was doping off. He knows the tech too.
Ethics is only used to get the tech back in. If you can use the tech why use ethics?