More practically speaking, most parents do not have the breadth of knowledge to spontaneously tutor their kids in every subject. Homework can provide fodder for parents to engage with their children on academic subjects the parent might not know well, or might not think to bring up.

I know some people are taking offense to your comment, but the reality is that even parents who very much wish to be involved in their child's education often need a nudge on what, exactly, to talk about.

Even parents who home-school their kids usually buy academic materials to use for this reason.

As every parent learns, there is no shortage of assholes who are quick to explain how you are doing it wrong. No matter how you parent, someone thinks that they know better and has no trouble explaining that in an insulting tone.

Thank you for being a case in point. It doesn't matter what else I do, (see http://bentilly.blogspot.com/2012/10/my-sons-flashcard-routi... for example), I can always be accused of being lazy from the peanut gallery.

I wonder how many actually bridge that gap - if education is just something to keep a kid occupied, homework will be same, I'm sure.

You aren't going to find a lot of overlap between homework being done and turned in and parents that view school as daycare.