Having small systems that do one or a few related things well is much better for scaling than a "does everything" system. It's also very generally an architect

Having small systems that do one or a few related things well is much better for scaling than a "does everything" system. It's also very generally an architecture that is easier to write/debug/extend/grok. It is nice though that Erlang gets you into programming for scale from day 1 without making it more work.