I think this is easier said than done. It pretty much sounds like you're suggesting there are pop-quizes. We've seen that style of teaching before. IME it isn't as effective. Though I'm quite suspect that a big part of that is simply coordination with other classes. All it takes is one teacher who thinks their class is the most important and not give enough wiggle room so that there is room for triage and expected life events. Just because there's theoretically enough time does not mean there is enough time. Think of it like lifeboats. Do you want enough lifeboats so that each person has a spot or do you want extra lifeboats so that in case one gets destroyed or in case a person is unable to make it to the other lifeboat that they will still survive? Over optimization ignores the noise inherent to reality.

I'm going to need some serious citation here. Through my personal experience, homework and at home studying were critical to my education. I would not have made it through any of my degrees (B.S., M.S., PhD) by just attending lecture (PhD doesn't even have lectures!), despite this being sufficient for high school and early college. Though, that does not mean this was a good thing as it only means the education was insufficient.

So... citation needed