Pros and cons of whole project as a module?

I am in the process of learning Kohana 3. Just curious: some Kohana 3 projects I have looked at, like Kohanut CMS are implemented as one big module and located in /modules instead of /application (which is empty). Why is that? Only to mak开发者_如何学运维e it easier to drag just one folder if you upgrade Kohana later?

All depends what you are doing. I sometimes split different sections of my application into multiple modules. Usually its just for organization or if you want to use that piece on another application.