I agree 45 days is fine for visitors, but what about the mechanical breakdown scenario? I have already explained in detail how this can bite you.
I've been to only a few Italian airports but IIRC none of them had GA maintenance facilities. So how can you be undergoing maintenance?
It's also one thing to have such a law on the books in say Germany, compared to Italy.
Aviation debts can be a big hassle if you are an aircraft owner. If you just rent then you don't need to care; you can walk away from anything including prop strikes
In 2008, after I flew to Tempelhof (like half of Euro GA
) I never got billed for the IFR procedures, but many others did. I went to some effort to check that I did not owe "Germany" any money which they could one day bite me for, and pretty easily I got a fax from the DFS confirming no money was due as of that date, and I carry this fax in the back of the plane.
Now try to get such a confirmation from Italy...