It's strange how certain things are. I'm pretty sure there isn't a good reason for it, thats just how it is supposed to be.
When you think of a refreshing drink do you think of a cold drink or a hot drink? You think of a cool drink right? Nobody says "mmm, I need a warm refreshing glass of water." Maybe a middle eastern dude does, but I'm pretty sure that the oil's gotten to their head. When you think of going swimming the hot tub doesn't sound refreshing, it sounds relaxing. Swimming in cool water (not frigid) normally sounds more refreshing. But when it comes to cleanliness the roles are slightly reversed. Warm communicates clean doesn't it? A cold shower doesn't leave you feeling clean, and neither does washing your dishes with cold water. For me, the goal when washing my dishes is to wash with water that is as close to scalding hot as I can stand. It feels more clean.
In a somewhat similar fashion potatoes are quite fickle. You fry a potato in stick form and it goes well with catchup. If you fry those same potatoes even more it would be wrong to eat with catchup right? I mean, only little kids dip their chips in catchup. A good bean dip might work better in this situation. If instead of frying those potatoes you smashed them up into a big pile you serve them with a gravy and some butter. You wouldn't think of pouring gravy on your Lay's would you? If you bake that potato instead of frying or mashing it, it gets neither catchup, bean dip, or gravy. Instead it gets cheese, sour cream, and chives (among other things). There are more ways to cook potatoes and more oddities about how and what their served with. Strange isn't it?

Just a couple of random observations about potatoes and water.