Git was created with a mailing-list workflow in mind, e.g. the way the Linux kernel works. That's why we have git format-patch, git am, git send-email, and that

Git was created with a mailing-list workflow in mind, e.g. the way the Linux kernel works. That's why we have git format-patch, git am, git send-email, and that's why there is an email field in commit authorship metadata. You can always put something else there (e.g. GitHub's anonymized addresses) or leave it empty.