A heavy object needs a strong spring. Likewise heavy arms are only suitable for cartridges with a sturdy cantilever. In other words: a cartridge with a low compliance figure needs a heavy arm in order to obtain a fundamental resonance in the region of 8 to 12 Hz.
A lightweight arm needs to be matched with a supple spring, in other words a very compliant spring which is the cantilever of a high-compliance cartridge.