I'm not being facetious here, after looking through the first two books and the beta of the third, the majority of each of the books share identical content. There's perhaps a hundred pages of actual unique information in each book. Rather than asking players who already spent $60 and want more setting information to drop another $120 for two more giant books of mostly useless pages, the core book could have contained all of the basic rules, ships and equipment and races and skills, and the setting stuff like obligation/duty/morality mechanics and the careers and specializations and talents could've fit into $20 splatbooks. It would have saved lots of paper and shelf space, not to mention money.
I've been trying to get my gaming group interested in Star Wars, as I really like a lot of the design decisions FF has made on it, but a light went out in their eyes after they asked about playing different characters and I had to answer, "Well, that isn't in the Edge of the Empire book, you'd also have to buy the Age of Rebellion book for another sixty bucks and if you want to involve Jedi you need a third book for another sixty bucks..." That's the same reason they gave up on FF's 40K stuff; every time new content was released it came as a new huge book despite having almost no actual content beyond what the other books had.
Edited by Valatar