Toon shading model

Can I ask what’s the status on integrating in the official branch of the engine? I’ve looked at the code and it seems to be nothing more than an editor extension to display the “toon” shading model in the material editor and a “if SHADINGMODELID_TOON” somewhere in ShadingModels.usf…

Well, it’s a little bit more than that, but what I’m saying is it’s a relatively small amount of code with relatively low risks and it’s fairly easy to check/review for an Epic dev. I don’t think it would even take them more than a couple of days to redo it all from scratch. Whoever just added the eye and hair shading models in 4.11 would certainly know exactly what to do to quickly add

So what’s preventing from being added to the engine? Why is it taking so long?