AVWW - If There's No Wind, Why Are The Trees Swaying?
It seems we are incapable of putting out a youtube video or getting an article on a major news site without this joke coming up in the comments almost word-for-word. Such is life!
The answer is simple: there is too much wind in the world, and in fact the wind is one of your main antagonists in a lot of senses. So the title of the game refers to a desired end state for the characters (wouldn't it be nice to live in "a valley without wind?"), rather than the current state of the world. While we're on that subject, that's not all the title refers to, but now we're getting into spoilers territory and so we'll leave it there.