Would bring compatibility with https://www.mediawiki.org/wiki/Extension:Auth_remoteuser
This allows integration with the web server's built-in authentication system (for example via the REMOTE_USER environment variable, which is set through HTTP-Auth, LDAP, CAS, PAM, etc.) or any other type of external authentication (SSL client auth, user accounts provided by different forum software, etc.).
Would bring compatibility with https://www.mediawiki.org/wiki/Extension:Auth_remoteuser