I think what is better about it is that the topstitching all the way around the outer edge of the quilt can be done farther from the edge. The opening that must be sewn shut is on the back and not as noticeable. This is certainly an advantage for kids.
I use this method on placemats and other small projects. I don't use the birthing method on quilts, but if I did, I would consider this method especially if the backing is already one to be pieced.