Also, it's not easy to sew straight lines. More often than not, the lines want to distort during sewing; and later the ends have to be closed tightly to keep the ribs in.
There are other annoying steps to making a hobbled shade the old way, but the real clincher is, I think they just look cluttered, like this:
The result is a perfectly neat shade without those tightly stitched pocket ends I used to hate making so much. If you're wondering about the safety standards, this shade was shrouded with ring locks during the stringing phase.