This is the content I've seen so far, limited to primary school children.
I'm German so my view may not be the prevailing one in the US, but I see my role as including making sure that the kids get a proper education. This includes making sure they are doing their homework and are revising for tests.
The consequence of forgetting (or "forgetting" ;) ) to write down their homework assignments or their books is not a work-free afternoon, an inconsequential negative remark by their teacher or a slightly worse test score (I'd argue that at primary school age consequences have to follow directly; a delayed test score does not register).
The first time it happened, they got a friendly expansion of the expectations. The second time an expression of disappointment. There hasn't been a third time.