On Monday, March 12, 2018 at 11:22:50 AM UTC-7, Hal wrote:
Keep the CN user interphase the way it is. Have you tried to manipulate a touch screen while bouncing in turbulence?

Yes. Does not work well with an in-panel display, but can work pretty well with a stalk mounted. Buttons actually aren't the best in turbulence either, knobs are better. The reason is you need a way to locate your hand independent of actuating something, a knob allows you to grasp the knob to locate your hand, and twist it with precision. Stick mounted buttons (or the Craggy track ball) do the same thing, hand is located by the stick. Panel mounted buttons are easy to miss, or actuate more than once in turbulence. A touch screen on a stalk can be grasped with the thumb and 4th finger, locating your hand relative to the screen which can be touched with some precision.

There is at least one display (Air Avionics L) that has both touch screen and knobs, with all functions available either way.

Of the lot, stick mounted buttons might be best, except you give up the rich interface offered by touch screen gestures on modern displays.