Teams playing fluid football (often interchanging positions, playing attractive football by making short passes, etc) and being dynamic (being able to change systems, not playing static formations such as 4-4-2 which are exposed through players playing between the lines) are progressing over teams playing pragmatic football (often playing 5-3-2, holding players back, hoping for a mistake rather than forcing the opponents to make one) at the current World Cup.
This might be slightly surprising as the World Cup started very pragmatically with an average of 1 goal per game in the first couple of games, the reason why these fluid teams are winning is because they are exposing teams with poor fitness, teams that hold back and play deep such as North Korea, South Korea and Australia were beaten 7-0, 4-1 and 4-0 by teams looking to attack.
Teams such as Chile, who play an attacking midfielder (Matias Fernandez) and Germany, who play Mehmet Ozil, are playing individuals who play between the lines (between the 4 flat defenders and 4 flat midfielders in a 4-4-2); it is a lack of these players for the smaller, more defensive and less ambitious teams that cause them to be beaten by more fluid teams as the fluid teams push their defenders up, with no player to expose the more space behind the defence.