Structure / Styling is Valuable

Most visual users can distinguish areas of a document such as what is a heading, where paragraphs break, list structures, and the flow of a document. Blind and those with visual difficulties who use assistive technology may not be able to do the same if a page is not structured correctly. 

In the example below, how difficult would it be to read the pages of the Wall Street Journal if all the text was the same size and font, no variation for the headlines? If there was no formatting such as paragraphs and lists? Instead of photos, there were just blank placeholders? What if assistive technology were to read this from left to right, top to bottom? 

Example: Wall Street Journal