I think we all do our own thing. I did my first pieced back when I was trying to "stretch" my backing to fit a bigger quilt top. I just plain needed it to be bigger. Then I sorta liked the "somewhat" pieced interesting look I came up with that coordinated with the front, and did it on several more. It's "2 quilts for the price of one" this way, although I never make my backs as showy as the front.