Are you comparing this specific version's against a modern alternative?

CS6 Extended allowed you to import 3D models (OBJ, 3DS, DAE, U3D). You could paint directly onto 3D surfaces, wrap 2D textures around complex geometry, and render shadow-catching backgrounds. The “13013” build perfected the OpenGL acceleration for these tasks.

Adobe Photoshop Cs6 Extended 13013 Original Work -

Are you comparing this specific version's against a modern alternative?

CS6 Extended allowed you to import 3D models (OBJ, 3DS, DAE, U3D). You could paint directly onto 3D surfaces, wrap 2D textures around complex geometry, and render shadow-catching backgrounds. The “13013” build perfected the OpenGL acceleration for these tasks.