Playing Devil's advocate to your last point - standardization of curriculum (including handouts), is a dangerous game as students get older. When every classroom is taught the same, with the same lectures, notes, and handouts, the incentive to pay attention in class dwindles as the resources available for that class increase.
A better example may be a typical college course. Most freshman courses at any large University can have an upward of 500+ students. Depending on how the Professor conducts their class, some students may find it is not worth their time to attend class or complete homework themselves, when it's more time-advantageous to simply scheme with others in the course. If you want a tangible example, pull up your favorite "study" site (StudyBlue, Quizlet, CourseHero, Chegg) and view the plethora of paywalled material for classes.
Of course, as class size shrinks, this advantage drops, combined with tougher content, typically better incentives students to attend class and complete homework individually, rather than as a group.