Deciphering Hashem's Expectations in Pesach

The Haggadah opens by pointing at the matzah and calling it the poor man's bread, before it has said a word about why we eat it. Why start there, when we are about to sit like kings and drink like kings?A mashal about a king who meets a young shepherd on a hunting trip, makes him his treasurer, and then finds an unexpected locked room in his house gives the reason. Rabbi Asaf Prisman connects it to a banner he saw outside a shul during the lockdown, and to what it might mean to prepare for Pesach in the heart before the kitchen.