Homework is a way to get parents involved because there is literally no way to teach kids everything they need to learn at school.
It’s a pitifully failed way to try and get parents involved because in the end the vast majority literally don’t give a shit.
My sister is a teacher and she’s constantly on about how little time parents put into their kids education. Note that she teaches affluent kids, I’d assume this is ten times worse in homes where both parents work or single parent homes with few resources.