As a civil engineer and landscape architect, modeling toposurfaces in Revit is time-consuming and, in some cases, not even properly possible (e.g., for embankments).
As a long-time Civil3D user — where you can design breaklines, easily assign elevations to points, specify slopes along edges, or automatically generate embankments — I wish for comparable functionalities in Revit.
Planning the entire terrain using only points is a nightmare.