title: Bundles are not encouraged in Symfony 4, why is that? And what replaces them?
body: <p>In practicing with Symfony 4.1 I noticed how it says on the bundles page: (<a href="https://symfony.com/doc/current/bundles.html" rel="nofollow noreferrer">https://symfony.com/doc/current/bundles.html</a>)</p>
  
  <blockquote>
    <p>In Symfony versions prior to 4.0, it was recommended to organize your
    own application code using bundles. This is no longer recommended and
    bundles should only be used to share code and features between
    multiple applications.</p>
  </blockquote>
  
  <p>Why is that and what is to replace bundles?  Simply create directories inside one "App" bundle? </p>
  
  <p>So a mere subfolder replaces a bundle?</p>