Yeah, there's rendering bugs aside from just the wrong plots showing up though on non-flat land. For instance, a river that runs across the seam will frequently appear empty, a ranged attack over the scene or a unit traveling over the seam will often appear to go off screen, and any sounds associated wit it will not play. There's really a number of things it messes up, even on flat land. I also just find it annoying if my empire is split over the seam. You're right of course that the true solution is to shift the axis to the "wettest" part of the map though.