Then rotate the large scale map too. I think what you are failing to grasp is for most people rotating/reorentating a map is a trivial task. I'm quite happy to accept that there are some people who may find it difficult. Everyone has different abilities.
Yup, you're right. Having to turn the book isn't that difficult.
What you are failing to grasp is that descriptions in the module will, very often, be oriented around cardinal points. Read a module. You can see many examples of it. So, simply rotating the compass rose isn't quite as simple as you say, since, it has issues that also affect other parts of the module.
But, again, the point you are failing to grasp here, and I'm beginning to feel like I'm simply being trolled, is that there is no reason, none whatsoever, to do this in the first place. None. In the face of overwhelming standards, the artist, for whatever reason, decided to ignore convention. And for what? There's no difference. There's no reality that needs to be described. it's a completely fictional place that has never, not once, ever been mapped or described before.
All these justifications like trying to fit a map into a space fall apart when you realize that none of them apply. This was a never described, fictional place. It doesn't matter if it's on the south shore or an east shore. Nothing changes by following convention, other than making the map easier to use. And since this is a game product, ease of use should be one of the most important criteria.
IOW, what is the justification for this? Why have north to the left? Give me a reason why THIS MAP, not other maps, not maps in an atlas of a real place, not geological maps, THIS MAP, ignores centuries of standards understood by people all over the world.