Again, your logic isn't clear. That a product exists on the market and sells, and, incidentally, has a graphical interface on its front panel, doesn't mean that people bought it because of the interface, and, as a result, stole sales from another company. Nor does it follow that adding a graphical interface to a product would increase its sales.
For instance, I had multiple Helix, i.e., products with graphical interfaces, yet, I got rid of them and use ones that don't have a graphical interface on the front panel. Why would that be? Because the graphical interface on the unit wasn't nearly as important as the sound and performance of the unit itself?