The rules for truck drivers in NZ state that they must have 30 mins rest every 5 1/2 hours.
In Australia for the heavy solo truck drivers I think it is 30 mins every 9 hours.
Both have maximum hours of duty ( paperwork/ loading / driving etc) that are the same or less than narrow body regional pilots.
Pilots are regularly doing shifts over 10 hours with no break at unsociable hours day in day out. There is certainly potential here for trouble if the pilots are reluctant to put their hand up and say they are fatigued. The system won't catch it because it is all legal so the sole responsibility to call it rests with the individual. Sound like a good plan?
In my mind it is a regulation issue. The Airlines will always see the limits as a target so the limits must be sensible.