Substance Designer is a material creation program that doesn’t require knowledge of GLSL. There are loads of free resources for artists and designers which include PBR materials. If it makes sense in your pipeline to use them then have at it (after reviewing the terms of each resource). But perhaps you’d like to make your own PBR material. Or maybe you’re looking to understand what each of the maps do in the PBR MAT in TouchDesigner. Either way, becoming familiar with the workflows of many tools leads to a deeper understanding of the fundamentals of rendering and it might just bring an appreciation to the possibilities that TouchDesigner provides.