I seem to recall that Mercedes Benz techs got bonuses for completing jobs more quickly than the official book time.
An example, I needed both engine mounts replacing on my CLS55, book time for the job was 4hrs. The actual time taken was 45min for the moment the car was on the ramp! Techs learn quicker ways to access things. I wouldn't call it a shortcut, as that implies shoddy workmanship, just a more efficient method.