Ridiculous idea. If the headcount is wrong, how are ground staff supposed to carry out their duties if the a/c has been closed up. Mistakes can be made during the boarding process, especially one as quick and chaotic as this airline adopts, and ground staff need to be able to access to the a/c in order to establish either who is missing, (and if they have checked bags in), or who the EXTRA pax may be. I have had arguments with Captains of this particular airline who were rushing to meet their turnaround time and could not understand that as a dispatcher I need to know EXACTLY who is or is not on board an aircraft before I will allow it to depart. Closing the door prior to the headcount is going to cause more problems than it resolves. Often I prefer to do the headcount myself, so I know it has been done properly - how can I do that if the door has been closed?