>>why do you think planes and other complex machinery have stuck with physical controls?

They're not, Garmin has offered not only custom touch screen flight decks[0] but they also have an ipad app that can be flown with.[1]

[0]https://buy.garmin.com/en-GB/GB/aviation/flight-decks/g3000-... [1]https://itunes.apple.com/us/app/garmin-pilot/id340917615?mt=...