Revit shows edges even if it is not a geometrical edge, but only a transition between different materials, for example edges generated between columns and ceilings, if they have different concrete grades.
WISH: The ability to control whether Revit should display only geometric edges or material changes - if possible both global control and view-specific overwritable - possibly also via control in view templates.
RESULT: Plans can be displayed correctly without extensive reworking. 3D views may appear "cleaner" in their appearance without "edges" that are not edges.