When Purim that falls out on shabbos we do not read the Meggila.
When Rosh hashana falls out on shabbos we dont blow shofar.
When Succos is on shabbos we dont shake lulav.
Why? because of Takana Deraba that shema yaavirenu daled amos breshus harabim meaning that we are concerned that he may have a qustion on how to fulfill the mitzva and will carry it on shabbos to the rov.
Why then is Pesach any different? This year Pesach is on shabbos and we will still do the seder.
But hold on: why do we not say that we are worried that he will come to the rov and carry his seder plate to find what to do, or bring his cup of wine to find out if it is the right size and so on and so forth? If any yom tov has the most complicated details it is pesach.
Now please do not answer what you find in the the few achronim like (hemek hamelech) or chemdas yisral or in shoel umashiv that the rov would got to the peoples homes or that the other yomm toivim by learning about the yom tov its like you fulfill the mitzva etc.
Those assumption are clearly a problem for many reasons one being that what they are saying is that really there is a issue of Takana deraba just they would go to the houses etc. So then that is a massive chidush and you do not find it mentioned any where not in gemara or any rishonim also if we were supposed to learn about the other yomim toivim on that yom yov it should say so in halacha.
Also Please no answers from Kabbala. I do not believe there is a good answer from Nigle part of Torah. And there is nothing wrong with that because there is such a concept that Torah has many levels and where one level stops one starts like peshat remez derush and sod where peshat cant answer remez can etc.
It is just so interesting that this question is not spoken about anywhere when it seems as such a simple and obvious question.