Like many faculty members, I know that the research suggests a blended or flipped approach to learning (where students do some work outside of class time e.g. by watching videos or doing readings, and spend the in-class time working on problems and actively engaging with material) is better by far than only using classes for lectures where students absorb information passively. The thing that always held me back from applying this approach was the enormous amount of time and effort it would take to create that out-of-class content.
