No other base units have a prefix, so why does mass?
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There are 2 variants of the system that use similar measures but, by convention, use different ones as base measure.
The SI system is MKS (meter, kilogram, second) as the base unit. The GCS system convention uses gram, centimeter and second as the base units.
The preference is somewhat mostly arbitrary and also somewhat practical. For most things we encounter and handle, MKS is the convenient measure. Scientists (especially dealing with chemistry) might prefer the GCS system. There is no “correct” measure.
MKS is consistent with many other derived units like Pascal, Newton and Joules.
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