I fully understand how this format could be frustrating to some people. I personally loved it because each new step/graph made sense and taught me something that helped me understand the next one. There was such a feeling of invested discovery in reading this post that it lead to me reading it a second time. 

Some writing styles don't work for some people, but this one really worked for me. 

The case of humans illustrates that even when you have a very exact, very simple loss function,

I don't think it's accurate to say that IGF is simple or exact. You could argue it isn't even a loss function, although I won't go so far.