As a regular user my feeling is that in FCO there is a tendency to give priority to Alitalia.
This causes the regular caos of long queues on departure effecting mainly the others.
In fact the two flow mentioned above are regulated by the amount of alitalia traffic on departure and on arrival.
Once the line of departing Alitalia is sorted there is a tendency to favour more landings on 16R.
Unfortunately this and other discrimination will continue to happen as long as the airport's owner is also Alitalia's owner and the owner of the land surrounding the airport.
On my view too much conflict of interest and politics involved on this issue which have fed an already ill culture of clientelism.
FA