Kinzen, I can see that. But look at SW, each book has all the rules you need even for using the force. But Jedi are in their own book. Especially if you look at the setting it makes sense to separate the game out.
You could have one focusing on Magistrates, hunting down maho-cultists, solving murders, laying dead ghosts to rest.
Another is focusing on being part of a clan delegation, duels, game of letters, matchmaking, sadane, art, etc.
And a thrid about being in the military, rising up in military ranks, tactics, war, mass battles.
But yes the core of all the books should have the same system and rules, but with these focuses, it also allows for each book to focus the clans and schools toward a theme.
You mean the way it appears FFG did for their Star Wars game, with different "campaign areas" each presented as a seperate package/product, including the basic rules from the ground up -- over and over -- in each set?
Sorry, to me, that's a complete waste of page space. There's never a need to keep reprinting the basic rules, and it strikes me as a way to fluff page count on a small expense, and justify a higher cost to the customer.