The suspention is designed to change camber and toe to facilitate the activity that causes the spring compression (such as cornering).
As the springs sag the ability to correct camber is compromised. Most 124 body cars now are runing more negative camber than the specs allow for due to a combination of spring sag and bushing deflection. The job of a good alignment tech is twofold. First he should pick out the areas that should be repaired, and secondly he should take whats left and make the best of it. The second part is where you separate real techs from functionaries.
Bosch Master, ASE Master, L1
33 years MB technician