A lovely point by Richard Thaler in Misbehaving. From pg 49:

The problem with the learning story is that it assumes that we all live in a world like the Bill Murray movie Groundhog Day . Bill Murray’s character keeps waking up and reliving the same day, over and over. Once he figures out what is going on, he is able to learn because he can vary things one at a time and see what happens. Real life is not as controlled as that, and thankfully so. But as a result, learning can be difficult.