Changes made to the UI around 4.20 destroyed my workflow, the UI in 6 is no different, so I'm staying with 4.16

@ Nevertrumper, I don't concider Iray to be outdated, the problem is it's implementation into DS4 was half assed at best. You see shader handling in DS is what's outdated, a shader in DS needs a shader file ( the actual code for the render engine), a definitions file (all of the channels you see in the surfaces tab are  created by it, it's also the go between for the render engine and the shader file) and a preset to apply it. With an Iray mdl you have all three in one file and DS just can't handle them.