Exposed filter option missing since alpha3

Following commit removed the exposed option in src/Plugin/views/sort/ViewsRandomSeedRandom.php Was there a reason? I need this functionality.

 /**
   * {@inheritdoc}
   */
  public function canExpose() {
    return FALSE;
  }

  /**
   * {@inheritdoc}
   */
  public function adminSummary() {
    return "";
  }