Absolutely agree. But for an entity like the UK govt having plentiful resources, it would be sheer laziness to go with a solution like Drupal due to ease in initial setup. Besides, most Drupal sites look sort of kludgy in appearance.
You do realize the "appearance" of a site has nothing to do with the underlying stack, right? A Django site can appear like a Rails site can appear like a Drupal site can appear like a ...
You can argue for differences in behaviour, sure; but appearance?