Bedrockgames
I post in the voice of Christopher Walken
It certainly makes for a very short-lived game company if it's only allowed to sell one short book.
I think he just means the core book (but adventures and setting books could also be part of the line).
This subject comes up a lot. I tend to cycle back and forth between wanting simpler, less prose heavy books, and wanting more complex, more prose heavy books. And my cycle seems to be every five years or so. Personally I think it is probably good for us to have books like the OP mentions, but also ones like the type he wouldn't want. I think some of it boils down to whether you are feeling like opening the book and getting right to the business of playing, or if you are looking for an RPG book that can pull you in with clever verbiage and inspire you as you read it. I find I often approach RPG books in these two ways.