Multiple studies have demonstrated that homework is only effective in limited quantities, even for math.
Solving problem after problem after problem does NOT help a kid learn math. It will help them memorize the templates that they were given. They will not be able to use that math in any other context, nor will they actually understand what they are doing. They just learn how to plug numbers into the formula and churn out answers. Kids learn how to solve equations and get great grades in math, but get to college and do not know what a “variable” actually is. They think that it is a blank space where they should insert different numbers.
Math is about learning problem solving, not about memorizing templates and formulas. Too much repetitive homework interferes with this, and the amount of actual work that a human can do effectively is limited.
Math teaching in the USA has been ineffective for a long time, and the USA has been scoring far lower on math than countries and systems which require a LOT less math homework.