I've just never been satisfied with the way my bindings look when I've turned them to the front and machine stitched them on the front. So though it's much more time-consuming, I've accepted the fact that I'll just be happier with my work if I hand-stitch them on the back. It's a little more forgiving that way too in terms of being able to adjust the binding slightly as I stitch to make it perfect-looking on the front. Just my personal approach.
Dana