Two answers and what is wrong with them. 1) On Pesach Rabbis came to people’s homes, but there were those the Rabbis didn’t know about because they were ashamed to admit they didn’t know what to do. Moreover if this is a law it should be written (some place and by some body). 2) On the other occasions (Shofar, Lulav) one can learn the parallel ideas in Torah in lieu of the Mitzva, which can’t be done Pesach which is an obligation on woman (who are Potur from Torah study) also. Moreover, if this was the reason, the Torah should tell us such huge chidushim more explicitly. Page 48-51.
