Are controls uniquely important, though? There are hundreds of things in a car that could be made better (more durable, longer lasting, better looking) for just $10 to $100 extra a piece. But it adds up.

It's not just cost, though. The reality is that consumers like the futuristic look, in theory (i.e., at the time of the purchase). Knobs look dated. It's the same reason why ridiculously glossy laptop screens were commonplace. They weren't cheaper to make, they just looked cool.