Because the coach is Casiragh.
Andrea Poli from what I've seen is really talented and is capable of giving the team some creativity, more than Abate (with a good sense of goals, too). Casiraghi's idea, however, is to reply on the three attackers with the 3-men midfielders and even WBs focused on defending. In the match against Serbia, one of the reasons why Italian coudn't win, IMO, was they had limited attacking sources. I'd rather apply to only two attackers but with more attacking from the WBs and midfielders.