When would we use molding polylines instead of polyline solids?
Polyline solids are very useful, but they do have limitations. A polyline solid can be thought of as a shape that is extruded along an axis. Implicitly, the shape of a polyline solid is restricted to a single plane; so if you draw a polyline solid in an elevation, for example, it will look rectangular in plan view and in other elevation views that approach from a different angle.
