I want to make mobility flow maps of region sequences (centroid of areas) and drawing everything just as LineStrings is just messy and confusing.
I would like to be able to create not just overlapping LineStrings, but curves and possibly have styling options like adding an arrow representing a direction of flow (middle, per interval, etc.).
Another possibility is to draw "subway" like map/diagram where LineStrings are shifted next to each other.
Also, there could be some function to automatically sum the "edge" values between same nodes and represent that part only once with weighted LineString.