Kirk, I understand fully why people use straight adapters, I'm just saying that "I" see no benefit, the Cambo or Arca are ideal for adapted lenses "for me" because they offer more than a straight adapter, obviously.
I personally wouldn't buy a lens in another format if I didn't have the opportunity to do something different with it, a 35mm Contax would give me nothing straight mounted against the GFX zoom at 35mm for example, it only becomes worthwhile when I can use tilt/shift and stitch within the image circle, something I can't do with the fuji lens. I am not a fan of adapters, I have never understood why people would spend thousands on lenses and bodies only to put a couple of hundred in to an adapter to fit it all together, I am sure they are better now but there was so much talk about having poor tolerances, internal reflections etc that I would never go that route, it's just hassle.
I am also fully aware that people adapt lenses because they offer something they like in the rendering, they are cheaper, they already own them, they cover a focal length they don't have access to in native mount, etc. etc. people have many options with the GFX, I am just explaining how I want to use it.