"One thing achieved by turning Ma Nishtana into a formula was that now there was no division of children into the wise, the wicked, the simple, and the child unable to ask. In a beautiful and deeply characteristic gesture, custom ordained that every child should ask in the same way, using the same words, so as not to put any child to shame. All Jewish children are precious and we do not distinguish between them."
Sacks Haggada
I don't understand. We DO distinguish between the children when we divide them into four categories where each one asks a different question. And we NEED to distinguish between the children because every parent knows [or should know] that each precious child is a world unto him or herself and thus requires a unique approach.