You're drunk if you see redbooks 6 months after a product release. It's more like 6 months after a newer version of the product has been released. In fairness, even fast moving technologies take about a year to get a book on the market to discuss their technology. Spring 3.0 came out in December, but we won't see the reference manual, Spring in Action, out until July or August.
I think we can really thank IBM for the Redbook promise. Still, the process is to throw 6 to 8 professionals in a room for a month and spit out a book. The books tend to read like that, with little flow, segmented, and sometimes contradictory.
And the product documentation isn't always acurate. Of course, the final product is never bug free, so why would you expect the documentation to be bug free as well.
Of course, if it wasn't for the lack of good documentation, I'd never have been able to get away with selling a small, $75 paperback book, entitled "What is WebSphere?"