I'm not complaining. There's a lot to say about each of these topics. Part of me wishes we could go back to the days when a major technical work would be released in a series of volumes with copious cross references. (The X and UNIX manuals come to mind.) It helped to just know you wanted to pick up Programming Perl, Volume 3: Regular Expressions, open to some page or another, next to Programming Perl, Volume 2: Builtin Functions open as always to the page on localtime.
Sadly, those days are gone and unlikely to return. The major multi-volume reference works that I remember were produced by the technical writing department at companies like AT&T, Sun, DEC and the like. (Yes, O'Reilly belongs in that list, but I'm not sure who actually wrote the X manuals.)
Then again, O'Reilly is living in an industry where competitors are using all sorts of dirty tricks to get books with wide spines to the market: thick paper, wide margins, large type, and long stretches of text (or code) that say nothing. At least O'Reilly is delivering the same kind of material the old multi-volume libraries used to deliver, while their competitors play games.