With physical controls, you can verify using touch (ie without sight) that you are touching the correct control, and then activate it. With touch controls, as

With physical controls, you can verify using touch (ie without sight) that you are touching the correct control, and then activate it. With touch controls, as soon as you've touched it, you've activated it. And touch screens have very few ways to verify your position by touch, since it's a large flat screen. Controls with a plethora of knobs and sliders have all kinds of terrain that you can use by touch to verify your position.