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How does this scale in practice? We already require students be at school for 7 hours a day. If they now have to watch 3-4 hours of lectures at home every day, then students are left with little time to do anything else.

What about those students who don't have stable home environments? How are they supposed to find multiple hours a day to watch lectures?

How does this address the underlying issue of students off loading work? You've replaced homework with lectures, but haven't solved the problem of making sure the student is actually participating.

Logistically, this could only work if you shortened the school days, but then you would need to adjust the rest of society around that. Many parents structure their work days around their kids school schedules, and if kids need to go school later in the day, or get out earlier, that places a burden on the parents.

From my experience it works fine if it's one class that's doing it. If multiple classes are doing it then like you said it's literally a couple extra hours a day watching lectures and most students end up skipping them, forcing the instructor to end up teaching during class time anyways.
We’re discussing university, right? It’s supposed to be a full-time effort, at least for a normal pace undergrad or any post- graduate program.

For secondary school, I do agree with you - homework load can be problematic for some students. But at the same time, my honors classes all came with hours of homework and I’m not sure I would have been as prepared for uni without it.