Earlier quoted context omitted.
Let me turn this around. As a parent, I think that teachers should pay attention to research on homework that says there is on average no academic benefit, but there is a huge cost in family conflict. You have enough time in the classroom to teach and provide practice time. Free family time up for what parents see best.
There's actually another way entirely to do it - have the time in class for working and have the time after for actively learning. So the students read and learn new concepts at home and practice them in group settings at school. Unfortunately, that depends on the home environment being conducive to learning.
So, in practice, does success in traditional school environments, even if the structure makes people think it should insulate from that concern.
The problem with admitting that the home environment is the biggest key to academic success is that it means policy actually needs to focus on improving that environment which lots of people (for different reasons) have ideological objections to. So we pretend that school is isolated from home and that if we can just configure school right, we can get results while ignoring the home environment. And we blame any failures on doing the wrong things to the school environment, not the fact that we are focussing on the wrong environment.