Earlier quoted context omitted.
I think "this method" is letting people absorb the main lecture/explanation at their own pace, freeing up teachers to focus on one on one assistance, identifying people who are struggling, focusing classes on mastery instead of minimum level competence (C students pass, but obviously have knowledge gaps), etc.
Cool. I'm curious how you'll implement it? Recently I took an Agile course at work where they had a similar method -- there was a 3 hour video that everyone was supposed to watch before the course. I'd say about 10% of people watched it.
I think in your case the problem was multifaceted. First, it was a 3 hour video on Agile. Excessively long, probably boring, probably unnecessary (in my own experience, the agile methods are mostly to get managers to see the light, not the programmers). Second, there was probably little penalty for not watching it either. I've been through Scrum training, it was boring and "successful completion" mostly meant sitting in a room and not doing my actual job for a few days. Failing the course would have required more effort than completing it.
For schools, obviously they'll still be grading your work and ensuring mastery of the subject where not watching the lectures would probably reflect on homework and test scores pretty quickly as you advanced, they're also much shorter than 3 hours, where your attention is less likely to wander.