My mom has been harping on this for some time & last year she came very close to convincing the priest to hold a parish seder meal for Passover. I agree with your point.
From what I hear that is also a Jewish tradition.....but seriously folks,
We hold the meal at our house with just the family (Mother-in-Law, kids, grand kids). We want it to be a family experience, a time to bond and reflect without the solemnity and guardedness that comes with Parish functions. It also lets the yopung ones share in the dialog without feeling intimidated by near strangers or adults.