On size and weight, there is a limit and trade off on different form factors. For a given size screen there is a limit on how light one can go and still keep the costs down and still produce a product that can stand up to the stresses and strains of everyday use.
Something that is ridged enough that will not break just looking sideways at it. Anything that is held in two hands has to be protected from twisting and flexing, and that protection (With in limits) adds bulk and weight.
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