And even if we were all wise, all men of understanding, all elders, all knowledgeable of the Torah, it would be incumbent upon us to speak of the exodus from Egypt. (Haggadah)
So odd! If the object is to convey the great miracle of the Exodus from Egypt why benefit is there if we already know all there is to know?
What is the raison d'etre or rational behind the the Mitzvah of bringing the Omer Offering (first grain of the season) and why specifically on Passover?
Why was Moshe Rabbeinu fearful that the Yidden would not be taken out of Mitzrayim even after Hashem promised they would?