Redis passwords

Why isn’t there an option to put a password on all redis caching options? Only for Lock backend. Now the other options are useless or insecure when not password secured.

$config[‘lock_backend’] = ‘redis’;
$config[‘lock_redis_server’] = ‘localhost’;
$config[‘lock_redis_server_password’] = ‘’;

$config[‘cache_backend’] = ‘redis’;
$config[‘cache_redis_server’] = ‘localhost’;
$config[‘cache_redis_server_password’] = ‘’;

$config[‘session_backend’] = ‘redis’;
$config[‘session_redis_server’] = ‘localhost’;
$config[‘session_redis_server_password’] = ‘’;