Indeed, according to his words, it requires explanation as to why it is a mitzvah for us to recount the Exodus from Egypt if everything depends on the performance of the mitzvot. The Maharsha also posed a question on the statement of Rabban Gamliel (Pesachim 116b) that whoever does not mention these three things on Pesach has not fulfilled his obligation, and they are: Pesach, matzah, and maror. Why do we need to explain the reason for Pesach more than other mitzvot? The Chasam Sofer answered (in the Haggadah) and this is his language: "What appears regarding this is that in everything we do, actions to indicate His miracles and wonders, and that we were in the utmost abasement, and He skipped over the end to elevate us to the utmost exaltation, nevertheless, there is no mention in all these actions that we were naked and bare without good deeds, and that the redemption was out of kindness, and that if we had delayed even a moment, we would have remained completely lost, Heaven forbid. Therefore, we need to recount this." End of quote. In other words, there are matters that are not elucidated through the performance of the mitzvot, and we need the mitzvah of 'vehigadeta' (and you shall tell).