Just busy work created by the GB to keep people feeling good about doing the work, and publishers love it because it is the EASIEST time a JW can do.
I agree with you with the exception of 'easiest time a JW can do' . If they can plant the cart and hide, or go get some others chores done then yes this is presently true, but may become harder and harder as more people become familiar with the kooks running the JWs, and who behind printing this delusional totally irrelevant bull shit that hardly no one can believe in, in this information age. So the time will come when only the most delusional JW will want to get any time in behind cart witnessing work.