David, thanks for taking the time, but I know how it is done in BIAB.

When you say: "I just don't don't get it. It's all right there."
All it tells me you have not tried anything better. It is like if you went to the same gas station that serves pizza year after year, you would develop a "taste" for that specific pizza. Does it have all the nutrients of most of other pizzas? Sure it does! Will it fill you up? Sure it will! But is it a good pizza??? Can you compare it to a good Italian pizza place pie? Well, you can say that they both round (or square), have tomato sauce and cheese on the top and you are really confused why some people would want something different... And to some your argument is valid.

P.S. If you have some time look into Scaler VST. Demo is free. Maybe then you will see, what BIAB is missing smile