Like most Italian structures, it lacks a real park...

Like most Italian structures, it lacks a real parking service and, often, one is forced to park where it happens.
The metro station, although relatively close, still forces you to walk a fair amount uphill which, for some, could be burdensome.
Furthermore, it is now customary to open only the entrances in front of the square and, consequently, the path from the metro becomes even longer. The acoustics are not the best and it can happen that the audio for concerts or conferences is unsatisfactory.