[protagonist]

*shrug*

RC is used for communication purposes and such as well. Sure you can use PMs, but that is slow and bulky for trying to speak to multiple people. Especially with GPs, who may have to discuss bans or jails.
In my experience, it leads to a closer community among the staff. Nobody feels left out.

Theoretically, LATs don't need RC either. They can just send levels to administrators. It's really a preference issue; RC is a useful tool to keep your staff coordinating with eachother easily. More RCs can streamline your operation, provided they're legitimate staff positions and not overdone (nobody needs 10 FAQs).