and it's a perfect equivalent not smth ridiculous like they have in Germany (some complicated system) and Turkey (star for each 5 titles). The Italian system makes them more valuable and significant.
Plus, legally we have a right to put a third star because there is no FIGC rule against it.
I remember some official from FIGC saying that if Juve wanted to put 3 stars on their jersey we would not be able to do anything about it.