title: why using android:configChanges is a bad practice
body: <p>I have gone through different posts and questions for handling rotation and <code>AsyncTask</code>. In each post it is mentioned that using <code>android:configChanges</code>
  is a bad practice. But i didn't find the actual reason why it is discouraged and why it is a bad practice. What are the disadvantage if we use <code>android:configChanges</code> to handle orientation.</p>
  
  <p><strong>Note:</strong> 
  I know it is already answered how to handle orientation and <code>AsyncTask</code>. but I want to know reason behind not using <code>android:configChanges</code>. </p>