Packers Conservative Pressure

The one thing I see time and time again is the Packers giving up big plays and allowing others teams to convert on down and distance. This happens to take place when the Packers decide to only bring three guys after the quarterback. Often you will see the Packers do this on third and long in which the line gets no pressure and the quarterback has all year to throw the ball and shockingly they convert. Its so stupid and is completely deflating to the defense. I understand that you don't want to get beat deep but it doesn't matter if you give the opposing QB 10 seconds to throw the ball. Just bring another man or two, force out an earlier throw, which most likely will lead to a 4th down and a punt.