The evidence fails to support the claim that homework is academically beneficial for students in any meaningful sense, as I showed in this chapter from my book The Homework Myth: https://www.alfiekohn.org/homework-improve-learning/.
Many HW defenders quickly pivot to claiming that it promotes self-discipline, responsibility, time management & study skills, etc. Yet over the last 20 years I've been unable to find a single study that supports this folk wisdom about HW's supposed nonacademic advantages.