ZD,
And your point is?
So RSZ”A did not have a minhag of gebrokts, or as it is called in the seforim, matzoh shruyah. And we also know that it was hard for him to chew when he was older.
Not everyone has the same minhagim if RSZA. And he never said it is a minhag shtus.
BTW, where in the Haggadah does it say that, I would like to read it myself.