It happened at Monza as well this year, there wasn't an official reason though.
I agree with RM, the nice thing about old tracks (or smaller events) is that you're free to walk from a corner to the other, and basically visit the whole track if you're into walking. I loved that at Imola and even if Adria is pretty limited in extension, there too.
At Imola I had access to all the place, from the box' tower to the main grand stand, still I walked around the whole track just to have another feeling of what's was going on.
Mugello is definitely overkill, the changes in altitude are enough to kill you, also that time I had access to the roof of the box, and that was a decent position to watch a lot of spots (albeit from a great distance) and the pits as well obviously.