Comment by eridius

In the common case, a lack of username/email actually indicates a configuration error. Blindly offering to set username/email may cause people to "fix" their config by re-setting username/email when in fact the lack of this is indicative of some other issue. Sure, _everybody_ sets up git once, but on the other hand, everybody sets up git _once_. The common use case is, by far, running with git already configured.