Why is it that below a certain volume, most cook pots have a certain shape, which I would describe as tall and narrow? Then above that certain volume, most have a different shape which is short and wide.
You never see small cook pots that are short and wide, and you never see large cook pots that are tall and narrow.
It probably has something to do with the weight of the water inside it and how the metal shape would deform. That and the minimum weight of metal to hold the maximum volume of water.