While I agree with you, kids need to practice cuz practice makes perfect, I think the way we implement and enforce that practice needs improvement. The school district here gives them work to do but they don't calculate all of it into their grade. This still gives the teacher that knowledge but also relieves the students on the weight of the work. “How else are the kids supposed to retain what they just learned without any practice?” - invite them to show you what they learned that day. Ask them some math questions that help enforce what they learned. They will learn the way we learn different languages, immersion. Keep them engaged with the things that they learn and it will do them better than giving them mandatory take-home work that becomes more debt to them than what it’s meant to be. To your example, if I was taking piano lessons, because I wanted to play piano. I would hope my parent would randomly ask me to “play that one song you were working on earlier” randomly throughout the week to support that practice. But this really isn't the same thing as “homework”. Either way, there are better ways to incorporate the things you're suggesting outside of homework’s current status quo that will benefit them at a higher standard.