[TwentyPosts]

The iPhone works because it's a device you'll look at all the time while operating its touchscreen.

The car touchscreen doesn't work since you need to operate buttons without directly looking at them, purely by tactile feel.

This is not a problem touchscreens we're able to fix so far, and I don't think this will change any time soon since there's just not enough ways for a touchscreen to provide this level of tactile feedback.