IMHO I think it is just a extra step (zig-zag) that I would not care to do. Possibly it would keep one from stretching the fabric to much.
I put my binding on with my walking foot, after I fold and press.
Since the walking foot does not have marks/guides, I have worked out a method, for me, to get the seam allowance that I want by moving my needle and using the edge of the foot.
One method that works for one person may not work for another. Find one that you like and go for it.