I'm not disagreeing with anything you're saying and despite my somewhat ranting comment I am not completely opposed to a mix of touchscreens and hardware interfaces: but I think you'll agree that there needs to be a decision made in terms of safety when you decide to use a touchpad for input. If you're adjusting the screen brightness on your smart phone, that slider doesn't have to be perfect, and maybe adjusting the cabin lights for an airliner doesn't have to be either: I'm just dreading the day when things like navigational headings and airspeed creeps into a touch interface because of "convenience". But if my observation about this trend is wrong, which I hope, that separation of concerns will stay in future designs as well.