I would like to start with one but I would like a better base, I don't like 'CoronaMTL', I don't want to spend hundreds of hours having library full of fallofs in diffuse (instead of 'Sheen' parameter), all metals as multilayered mess when all I need is coating inside the material,etc..For Archviz, good material is very simple, and is fully driven by high-quality textures, so they're easy and quick to build each time.