The official, codified halakhah says that we are obligated to eat matzah only one day, the first night of Pesach at the seder. But there's another tradition that understands the mitzvah of matzah to last for all seven days of the festival. This is no ordinary machloket among the Rabbis but a full-blown critique of the codified halakhah by scholars who find that official version to be spiritually insufficient and contradictory of the purpose of the mitzvah. We have here, in other words, a pretty good example of progressive halakhic thinking... by poskim who we don't normally think of as "progressive!"

Source sheet available at www.freehofinstitute.org/learning, scroll down to the Twelve Minute Shiur.