When I read the 4HWW (probably close to 10 years ago now... time flies) what I got from it was a story of someone who went from his business owning his time to him owning his business. I agree there's nothing particularly "complicated" in the book but all in all it left my life in a net positive. E.g. the first time I even considered hiring a virtual assistant was from reading the book.
I was a lot younger than I was now when I read it, but since then I regularly listen to Ferris's podcast and generally enjoy the content he produces.