如果我不为Laravel使用任何MongoDB包，会发生什么？

Question

I'm working on a Laravel Project with MongoDB & I don't want to use any package for MongoDB. I want to write MongoDB Codes regularly like :

<?php
    $m = new MongoClient();
    echo "Connection to database successfully";
    $db = $m->mydb;
    echo "Database mydb selected";
?>

I had some questions :

1. If I don't use any package I need change CONFIG in Laravel Files ?
2. What happens to AUTH ? It works or not by using MongoDB or I should make Some Changes ?

Thanks ...