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The strongest empirical criticism is age-specific: homework in elementary grades often shows weak or no clear academic benefit, especially compared with in-class guided practice. If the main payoff is small in the age range where homework is often normalized, stopping it there can improve efficiency without much learning loss.
Assignments done outside school depend on quiet space, internet access, parental help, time, and emotional stability. When those inputs vary, homework can measure household resources as much as student understanding, making it an inequitable basis for practice, grading, or advancement.
Especially when loads are high or deadlines stack across subjects, homework competes with sleep, recreation, extracurriculars, caregiving, and unstructured play. Even if some academic benefit exists, schools may reasonably judge these tradeoffs too costly, particularly for younger children.
If assignments are repetitive, confusing, or lack timely feedback, they can reinforce mistakes, create resentment, and consume time without much mastery gain. In that case, abolition is not only about volume but about removing a commonly misused instructional tool.