Do uber shaders generally include deferred shading workflows? Or is it done by the application?

I thought of something like

class ForwardShading : public ShadingTechnique {
public:
  void turnOnShaders() { forwardUberShader.activate(); }
};

class DeferredShading : public ShadingTechnique {
public:
  void turnOnShaders() { deferredUberShader.activate(); }
};

Has this issue been addressed anywhere?