Prior to that it is just teachers shoving their teaching duties off on to the parents.
It should appear before HS. After that and it is too late. Yo start good habits young. Given what they teach, or should I say don’t teach in grade school, perhaps it isn’t necessary. I had my homeschooler doing algebra at 7. Homework was necessary.
Yes! Teachers, realizing that their math and reading methodologies failed, would push off basic reading. spelling and math to parents. Most parents were homework is not enough “alert” time for parents to fill in for the failing schools.