The Gemara says the reason we don’t say full Hallel the last 6 days of Pesach is because the Musaf is the same as the first day. The Beit Yosef says that we don’t say Hallel on the last day(s) of Pesach because the Egyptians drowned on the 7th day of Pesach. Why did the Bet Yosef feel a need to add another reason?
Shiur provided courtesy of Torah Anytime