Homework helps reinforce the material learned in class. It's already a problem where there is too much material to be fit into a single class period. Trying to cram in enough time for homework will only make that problem worse.

Can do the work the next day to reinforce.

As I said there are countries without homework and they seem to do ok. So it’s not mandatory by any means.

>Can do the work the next day to reinforce.

Keeping the curriculum fixed, there's already barely enough time to cover everything. Cutting the amount of lectures in half to make room for in-class homework time does not fix this fundamental problem.

Just make lecture times longer.

students already don't pay attention in lecture:

* due to either learning/concentration issues * the fact that most lecturers are boring, dull, and unengaging * and oftentimes you can learn better from other sources

making lecture longer doesn't fix a single one of these issues. it just makes students learn even less.

There are such legal, cultural and economic differences between countries that no homework might work in one country but not at all in another.