I agree that touch is a lousy input method, because it's imprecise and you can't see what you're touching. But phones have other input methods, like the acceler

I agree that touch is a lousy input method, because it's imprecise and you can't see what you're touching. But phones have other input methods, like the accelerometer. Even early iPhones had a ball rolling game that you could play by tilting the phone. With a modern phone, a controller, and something like Google Cardboard, you could make a decent VR FPS game. And by making imaginative use of the camera and microphone (both movable), you could probably do even more.