I have a sort of meta-question, Specifically about non-fiction work: if one gets the central idea contained in the book (say, from a blog or Podcasts or YouTube video of author explaining the ideas) - Is it still useful to read the entire book?

If a book is fundamentally about “ideas” — aren’t there more efficient ways available today (that were not pre-internet) to learn those ideas more quickly?

As an example: There is a Dave Rubin podcast where Jordan Peterson lays out the 12 Rules of Life very clearly and concisely. If one knows the rules and understands them, is it still necessary/important to read the book?

I wonder, just how much “reading the entire non-fiction book” is increasingly now an archaic way to ingest new ideas?