Someone who knows all the laws of Pesach is still required to ask questions, and scholars on their own at the Seder are required to ask themselves questions. But why?
At a certain level, the questions serve as an external pretext to refresh the memory in order to raise the level of consciousness concerning the Exodus even for those who have passive knowledge of the information. At another level, someone who asks himself or herself questions and then answers them, can delve deeper and discover new aspects of knowledge and self-knowledge.
Find fascinating articles and essays about Pesach from scholars of the Shalom Hartman Institute, including Donniel Hartman, Yehuda Kurtzer, and many others.
Shalom Hartman Institute is a contributor to the diverse Pesach content on Haggadot.com, a free website allowing users to "build their own" Haggadah. Find many of the articles listed above, as well as material from many other sources, on the Haggadot.com site.