Why is webform_get_submission differently arrayed from webform_submission_update?

I wanted to be able to update some values in a submission (like a status field), and discovered that the format used by webform_get_submission isn't directly compatible with webform_submission_update... Why? Enclosed find the fix I used, and if you could add a API (webform_put_submission?) function to do this more cleanly in the future, that would be nice...

function module_statusapprove($nid, $sid) {

// annoying that I have to do an include, when the webform module is already installed and functioning... why isn't these functions loaded by default?
        include_once(drupal_get_path('module', 'webform') ."/webform_submissions.inc");
 
       $submission = webform_get_submission($nid, $sid);
// $submission is an object, not an array  - Is there a good reason to return an object instead of an array here?

// begin custom code here.  We'll change the status field (#15) to Approved. 
      $submission->data[15]['value'][0] = "Approved";
        
//now we want to save the data.  We could avoid all of this, and do direct SQL.  But isn't that WHY we use APIs?

// the problem is evident:  $submission->data is in a different format from what webform_submission_update requires...
      
// one function uses $nid, the other requires a full node passed to it.  Ok, that's easy to solve. 
         $node = node_load($nid);
     
/* $submission->data is in the format:

Array
(
    [1] => Array
        (
            [value] => Array
                (
                    [0] => Actual Value Here
                )

        )

    [2] => Array
        (
            [value] => Array
                (
                    [0] => Actual Value Here
                    [1] => 
                )

        )
       etc.....

But we need massage the data like so:   */
 
        $resubmit = array();        
        foreach ($submission->data as $field => $value) {
          $resubmit[$field]=$value['value'];         
        }

/* ending up with:

Array
(
    [1] => Array
        (
            [0] => Actual Value Here
        )

    [2] => Array
        (
            [0] => Actual Value Here
            [1] => 
        )
    etc...
*/

        webform_submission_update($node, $sid, $resubmit);
        drupal_set_message(t('This submission has been approved'), 'info');
        drupal_goto('node/'. $nid . '/submission/' . $sid);
}