Every time you engage the system it tells you to pay attention. It also has sensors to detect when you don’t and forces you. If you have more than N violations in a trip, the system is unavailable for the remainder of your trip.
I don’t know how much clearer it could be.
I would argue that the system is actually so good (but imperfect) that people overestimate how good it is, and let their guard down.
If a system were more error prone, people would not trust it so much.