Why does only WinGDI produce the correct output with small lines and dots while DirectX and OpenGL don't display them properly?

WinGDI is a 2D-vectorization device so small lines are visible; Silicon Graphics OpenGL® and Microsoft® DirectX® are 3D-vectorization devices, so small lines become invisible (it is a feature of OpenGL and DirectX APIs and can’t be changed). In Autodesk® AutoCAD® you can see a similar behavior: in 2DWireframe mode small lines are visible and in all 3D modes they look similar to ODA when using OpenGL and DirectX.