Unless you are really meticulous about having all your material respond realistically, stick with Firefly rendering.  However, with the PhysicalSurface node used in Superfly, you have a simpler approach to achieving realistic renders rather than faking most of your shaders.  Accept the fact that the Simple Material Room does not support Superfly setups and that it is not coming back.  There is no point whining about a feature that has limitations in constructing complex material shaders.