A university has decided to replace traditional lectures with online recorded content, allowing students to watch at their own pace. Educational research shows that students have different learning speeds and styles, and that allowing self-paced learning improves comprehension. The university points to studies indicating that students retain information better when they can pause, rewind, and rewatch difficult content. Recording lectures once also allows the university to employ fewer teaching staff, reducing costs while maintaining educational quality. Student feedback from a pilot programme was positive, with 75% reporting that they appreciated the flexibility. The university plans to extend this model across all undergraduate courses within two years. Which one of the following, if true, most weakens the above argument?