Re: Touch screens
To have physical controls requires the buttons/sliders/levers themselves, the wiring looms and wiring to connect them, plus the labour to install and connect them all up.
Well I give you that having physical controls will complicate the dashboard construction, however there is no reason why those controls can't simply plug into a computer which presents the same digital/analogue interface to the rest of the vehicle as the touchscreen gismo.
Remember with physical controls, the Chimp remembers where they are and the knob/button etc. tells the Chimp how to use the control. With a touchscreen, whilst the Chimp knows to touch, it requires higher functions to tell it the required sequences and sort the mess out when it touches too many times or in the wrong place...