Why don't schools simulate a typical 9 to 5 work week for students and remove homework entirely?
I know this is typical for the US so this is more for US people to respond to. I wouldn't say that it is the best system for work, just wondering about the disconnect.
I think there is some nefarious reasons for the current setup but here's a point I didn't see. People and children especially can't learn for 8 hours straight learning needs to be broken up with play time or eating or socializing. Then reinforcement of what you learned earlier before you go to sleep can be helpful. Ideally I don't think homework should be learning new subjects or really hard at all it should be a cake walk of whatever was learned during that day.
My high-school biology teacher suggested that we study during commercials with whatever our favorite 30 minute show is. She claimed it helps retention set in, and you will even link concepts to the show further assisting in information retention.
"Ideally I don't think homework should be learning new subjects or really hard at all it should be a cake walk of whatever was learned during that day."
As professional educators, that's what many of us intend. In my case, many kids just don't really practice the new stuff in class, so when they get home they think it's new. I fixed that issue a few years ago, but it's crazy what a hard time some kids have with pretty basic self-regulation. I don't blame anyone in particular, it's just tough.