I can not see anything wrong with a homework question. Any monk has the freedom to answer or not. Student A ask a friend and student B ask a monk. If HW questions get a delay of a week, some monks answer the question, but the student may not be interested in the answer anymore. Also some students may ask in a different way to get the answer just in time. And a monk must read a question and decide it is homework or not. That may result in a delay for a regular question, since monks are not perfect.