Barca was really vulnerable today. That's a major lost opportunity for Inter. Pique couldn't even be bothered in the 1st half.
Of course, the 3-5-2 becomes a 5-3-2, the 3 CBs are marking maybe one player, the 2 strikers can't help the midfield enough. Barca comfortably moving the ball in midfield when any bit of pressure would put them off immediately.
Conte seems happy to stick with this tactic until he retires.