Contexts are in practice pretty nice, and you don't have to use them. I've found that in my own work with 1.3.rc.*, the contexts describe an area of the system

Contexts are in practice pretty nice, and you don't have to use them. I've found that in my own work with 1.3.rc.*, the contexts describe an area of the system and help enforce some separation of concerns. That said, you're free to build everything in one context.