Am I the only one abashed by the fact that the reverse engine trigger is a slider on the touch screen? That's probably the last control I would have thought about putting on the touch screen.
All in all, it's a control that helps you maneuver a 2 tons vehicle, like your wheel, your gas pedal and your brake pedal.
I personally think this kind of control should never depend on a flimsy touchscreen that can break or bug more easily than a mechanical control (although I agree it's less important that the wheel and pedals).