No method today is a panacea. RAG naturally isn’t the approach you would take if you’re trying to summarize a large body of text, as in your example. That doesn’t make sense. That is not what it is for.

What it’s awesome for is asking a somewhat specific question about some thing in a book if it can be answered by reviewing a paragraph or a few across the entire book.

So to answer your question: Start by using the right tool for the job. The problem with this is: Some tools are prohibitively expensive, challenging, or very time-consuming to use.