Your first point is trivial. Shooting a fixed point target from a fixed position is very different from shooting a moving target with an unknown position from an unknown position. The rifle qualification exists to establish that soldiers know how to aim the rifle, not to establish that they can hit a real target.
The rifle qualification for the USMC is 500 yards from a fixed point, Soldiers and Marines are generally expected to hit a man sized target from a supported position at 500-600 yards and non-supported at 200-300.
