The idea here is to use ‘freewriting’ as a way to get your thoughts on paper, as part of solving a problem or growing your business, or just getting started on a writing project. You might not think that such a simple idea could be expanded to book length, but you would be wrong. Oh, sure, the main points actually could be presented well and thoroughly in a short pamphlet, but you wouldn’t be inclined to shell out $17 for a pamphlet, now would you.
Snarkiness aside, I suspect these are some really useful techniques - turning off your mind’s ‘internal editor’, getting your ideas to start flowing and getting them into a document, etc. And Levy helpfully provides a number of techniques for getting started and for getting unstuck.