Yeah but I can’t stuff an iPad into my pocket. Back in the day when I rode my dinosaur to school, we paid extra for miniaturization in technology. The more ability that could be packed into the smallest chassis possible, the higher the price. That hasn’t completely died out yet.
Though people tend to think the opposite, because Apple has been pricing larger phones higher than smaller ones. But that is because the larger display size adds to the utility without sacrificing portability, as long as you stay within the dimensions popularly accepted for smart phones.
Once you start pricing smart phones against tablets, the parameters change.