The answer to your most significant question. The solution to your problem. The main claim of your argument. Papers Exist to Support Point Sentences. Every sub-section has a point.
Every section has a point.
We can therefore ask, what s the point of the paper, of the section, of the sub-section, and of the paragraph. Williams practices what he preaches, making points clearly and concisely. This is an approach that propellerheads, scientists, and technologists could appreciate. Schoolhouse is one of the best practices cited in the Boyer Commission report. Clarity and grace are beautiful.