Schoolteachers are trained to provide just this type of variety for just this type of reason. For example, they're supposed to have competitive classes because

Schoolteachers are trained to provide just this type of variety for just this type of reason. For example, they're supposed to have competitive classes because boys are generally more motivated by competition than cooperation. It's uncontroversially seen as a good and wholesome thing for teachers to do it. Why is it demon spawn for programmers?