There are real clients and real numbers involved. There's an end product that is going to be produced. You can't brush any detail away. Everything has to be right. That sense of responsibility is a key ingredient in all successful internships, according to Johnson-Bogart.
Students recognize that the stakes are high.
That can be daunting but also motivating. They see the implications of all that they have learned in class. If they are given real responsibility and commensurate support, they rise to the occasion. I can't think of a case where a student hasn't. Many students regard internships as stepping stones to a future job, and there is much truth to that view.