If you're looking for any platform, high level generalizations, searching the Internet would likely be best.
Cisco architecture information, that they provide, that I recall seeing, is platform specific. It also doesn't much explain the benefit of the architecture you've asking about, likely because it assumes that's already understood.
The main benefit of a modular switch chassis is mostly due to flexibility of what can be installed in the chassis, not so much about forwarding or scaling, beyond trying to design a chassis to support modules that don't yet exist. (Proof of the latter is why new chassis are provided, although architecturely they don't logically differ much, but capacity, physically, they do.)
Unfortunately, I suspect you won't find the above very helpful, but your questions are addressed in books. On these forums, the more specific the questions, often the more specific the reply.
