Chapters 1, 20, 22

While reading the first assigned chapters many things came to mind. Here are a few of them:

In chapter 1, the idea of a dynamic interaction between the writer and the reader was introduced. How can this be? The writer can't interact with the reader as they are reading their work. The words on the paper can't change depending on how the reader is feeling.

In chapter 22 it discusses a basic outline for writing a proposal. It seemed fairly similar to the scientific method with a few alterations. Introduction could be related to hypothesis, the problem could be related to the problem at hand, etc. I was wondering if there was any correlation between the two.

I also noticed a central theme about writing "Reader-centered" pieces of work. Is there ever a time when this will not be necessary? I can't really think of an example, it was just a thought that I had.