[adrianmonk]

I think this would suffer from the same problem as partial self-driving cars: it's human nature for vigilance to falter if it doesn't feel like you're the sole/primary one in control.

Of course, you can say "I won't let myself do that", but working against human nature is not a formula for success. If my back hurts, I can tell myself I'm just going to go lie down on the bed for 10 minutes but not take a nap, but then 30 minutes later I wake up feeling groggy.