There are lots of ways to set up a enterprise server environment for Drupal, but in dealing with IT folks who are coming from other Content Management Systems (CMS) or worse static sites, there is an asumption that for an organization to have control, that they need to have a completely isolated server.
Many organizations historically have not had a CMS which had the workflow structure and level of interactivity that Drupal comes with. Historically, the staging server has been used as...