Why clouds? Sure I understand the theory of the water cycle. But the whole precipitation and evaporation thing is a complex mess. It doesn't look at all like t

Why clouds? Sure I understand the theory of the water cycle. But the whole precipitation and evaporation thing is a complex mess. It doesn't look at all like the simplest possible form that could achieve the same job. Why not just water above the firmament? When something in nature seems needlessly complicated, one has to ask what purpose the complexity serves. Why would a hypothetical universe engineer (dare I say "god") sit down and decide to have a universe that is indistinguishable from a classical one on nearly every length scale but is still quantum at the bottom? There's only a few possibilities: 1. The complexity isn't actually needless but it is arbitrary. There are other self-consistent laws of physics that are possible, but all the alternatives are just as weird and complex as QM. 2. The complexity isn't actually needless because QM is inevitable. There's some deep logical principle that forces the hand of the hypothetical universe engineer. 3. There complexity actually is needless. Our universe is quantum because that's just how it is.