Last years POTY had heaps of 'milky'water shots

To my mind there is a balance:-

Too milky and the water takes an almost solid bland form, rendering the view of awful plastic or pollution etc., which to my mind renders an image to dissapoint, unless you are highlighting the aspect of polluted water!.

While 'a touch of milk' highlighting the flow, atmosphere, or rythmn of a river or sea, with some areas of clear water and sparkle that shouts, wet shiny water, can turn a normal scene into something a little more special, simply as the scene starts speaking, tells a story to the viewer.