But i bet its just that some fans and the designer have different opionions how a map in a medieval game should look like. The designer wants a classical normal looking world. And some fans would like a more minimalistic looking world, somehow closer to the map we see at start of "Lord of Rings".
Maybe there is room for both.....or even better....still planned.
Maybe this world looks like we saw it on this fotos from close, but very different from higher above. Like it is in HoI3 too. There the map from far looks like a old folded map form the old days of WW2.
I bet the fans would smile big to see the CK2 Map in the style of Middle Earth when you zoom out far enough.