Perhaps it is because that the appearance of the directory will make some kind of clarity?
I myself knew by experience that it is very difficult to understand what is really the rule. One example: all the time I drove through the pictures Sheremetyevo, spent the whole day in anticipation of the expert and filled pile of papers. And at Domodedovo told me: "And less than 50 years since the creation? I do not need to fill!"
Now I go through Domodedovo