I'm not sure if you're familiar with public domain texts from around the 19th or early 20th century, but they were not intended to be skimmed or speed-read the way we'd skim a modern text prior to getting into a more attentive close-reading. Even their short magazine articles were actually the near-equivalent to our scholarly papers, and were often read aloud at length in parlor gatherings. So having a LLM split the text into manageable sections for you and provide a hint of what each lengthy wall-of-text paragraph will be about is actually a huge gain in readability.
So before you were talking about summarizing whole articles and asking the LLM to find the things that would be "beyond the pale", but now you're just suggesting using it to insert paragraph breaks and section headings?
The LLM will easily do both for you. Particularly the thinking it does when constructing the summary generally involves a structured close reading of your text, and you can easily think of it as providing "paragraph breaks and section headings".
> So having a LLM split the text into manageable sections for you and provide a hint of what each lengthy wall-of-text paragraph will be about is actually a huge gain in readability.