They make sense of it in terms of story, at least the Gridanian and Botanist quests. This isn't a nice, mystical forest (the music gives serious evidence of this also) but hunting trails that must be rigidly adhered too or basically the elementals will destroy you. Also, if you take a good walk about there is some seriously impressive stuff to see in the Black Shroud, with the river runs being a favourite. Murmur Rills has a great bit, and it is filled with demons! Also, I very much like the Black Shroud and spend almost all my time there. Opinions.
Not going to get into other parts on specific terrain as PS3 pad is killer to type with haha. As to your comment Rimmer, I have no doubt more will happen but at the same time, minus us adventurers, outside the city-states appear to hold only fear and the Empire, except for some scattered Hamlets near certain roads.