为什么mysqli_affected_rows将链接作为参数而不是查询？

Is there any reason for mysqli_affected_rows takes $link as first parameter instead of query?

example usage for mysqli_num_rows

$con = mysqli_connect(..);
$query = mysqli_query($con, "SELECT * FROM table WHERE id='5'");
echo mysqli_num_rows($query);
//output: 1

example usage for mysqli_affected_rows

$con = mysqli_connect(..);
mysqli_query($con, "UPDATE table SET column='value' WHERE id='5'");
echo mysqli_affected_rows($con);
//output: 1

Shouldn't it be better that mysqli_affected_rows takes $query instead?

Because mysqli_num_rows counts the number of the results in the query.

But mysqli_affected_rows queries the server to get information of the last event.