Injuries are real enough. The referee decides how long the game goes on. Its a more exciting experience for the fans.
Play goes right through the very end. What we saw in the past month in Brazil was pure unadulterated football.
Some of these soccer players flop more than the Duke basketball team.
What I like about the timing in soccer is that if there is a threat on goal when the clock runs out, the ref will wait until the threat has ended. That makes for some exciting finishes. That is an accepted practice in soccer and everyone involved approves of this tradition. The tradition is so strong that if a ref violated it, the authorities would note it with a strong disapproval.