I can tell ya why. I call it KISS (Keep It Simple Stupid) I have several radios and I know I don't use them to there full capabilities, I just did what this gentelman is doing setting up dual elevator servos, got help here and was sent to a site with the programming I needed for my radio. Works great, happy I didn't have to use reverser, but the rest of my planes I stay with KISS, maybe later I'll use some of the radios extra features, but right now I'm flying the plane ( I should say trying to fly)  not the computer / radio and KISS works for me.