In college my classes in the business school would hand out binders containing the PowerPoint decks for the whole semester and would usually make them available online as well (some were even accessible to the public). Classes were also recorded for later viewing. The arts & sciences classes required textbooks. The professors were often co-authors of those books too. I don’t think it is a coincidence that the quality of education was vastly superior at the business school. For more reasons than just using textbooks vs slide decks but that was a factor.