simpler is not the right word either. it's the one that makes the least assumptions, not the simplest. The simplest would be "god did it" pretty much everytime.

> The simplest would be "god did it" pretty much everytime.

An out-of universe entity, that is by definition too large to be understandable to anything in universe, is a lot, but not simple. Are you sure, you are not confusing easy and simple?