Okay, going to try a different illustration to show the relationship of subject matter to print.
Forget the real numbers, my scribbles are not to scale. They are meant only to convey a concept.
In this case I want to show how various changes in development might change our choices of camera or enlarger exposure.
I know it is cluttered, sorry, but these are hand drawn. In the second example the alternate print range is added and it shows how shadow detail gets lost below the paper's range. If we put 2&2 together we can see that we could reduce camera exposure and get the same print range. With careful observation and a little imagination we get to see how and why a push works and the compromises it makes without 7 pages of text.