I do not know what Tata is doing. The line-up changes are so obvious. This is not about someone like Di Maria (who should see the bench also) who plays horrible but about playing styles and it is beyond me how Tata does not realize that his team needs different kinds of players in midfield.
Argentina is attacking all game basically and every opponent is simply trying to avoid to get exposed by the incredible individual talents upfront. So why are there two holding mids? Please do not come up with it "Biglia brings balance" because in the type of games Argentina is playing in this Copa it is simply not true. He could play an important role against a team like Chile who play attacking football, want to keep the ball and press all the time but Biglia is redundant besides Masche.
Banega is the perfect replacement. He plays kind of a false 10, an attacking mid that drops deeper and likes to orchestrate play which would allow quicker play from the back and would allow Pastore and Messi to connect midfield and attack. Without a player like him there are too much moments where Argentina's attacks become to slow and static or guys like Garay simply kick the ball away under pressure because there is no one in front of him who is able to receive passes under pressure.
Tata stands on the sideline and watches this shit for 80 minutes knowing that there will be no extra time. Of course he is not responsible for scoring (Argentina had chances) but you can not expect to win every game by scoring from let's say 2 good opportunities. You need to have more of them if you control such large parts of the game.
For me this line-up would mean that Argentina would definitely be able to apply a huge amount of pressure all 90 mins: Romero - Zabaleta, Garay, Otamendi, Rojo - Masche, Banega, Pastore - Messi, Agüero (debatable), Lavezzi (because Di Maria is awful right now)
Maybe even Masche for Garay and Biglia besides Banega in midfield but that could be too big of a risk. The squad could be not used to playing without Masche in midfield.
Anyway, what I am trying to say is that there it would be very simple to make almost 100% sure that Argentina would create much more scoring chances without losing control of the game and being exposed at the back.