Europe’s elites don’t want people who are actually of European descent coming back to Europe as citizens, especially North Americans. Constitutional law is irrelevant to them, but they love third world migrants for some strange reason. I am aware of one citizenship case that the European Court of Rights refused to hear by just ignoring it and pretending it was filed late, when it plainly wasn’t. Migrants have human rights, but ethnic Europeans outside of Europe don’t according to the European ruling class.
When the law was first changed, I read that Italy changed the law because a large number of people, mostly from South America, were claiming Italian citizenship through their bloodline, but they had no connection to, or real appreciation of, their Italian ancestry. The way Italy saw it, many people only wanted Italian citizenship for the EU passport. Supposedly, many of the South Americans were so far removed from their Italian ancestry that they had to hire companies to research their ancestry to find out if they had an Italian ancestor. Under the new rule, I still might qualify for citizenship, but I see no point in it.