There’s a good description of the history of the expanded gravel tag on the Australian forum here. Short extract, “ TL;DR: Looks like a non-native English speaker individual created a continuum of of sand - fine_gravel - gravel in 2008 when sand - gravel - rough_gravel or just sand - gravel would have fitted the vernacular better. Never discussed or challenged…”. Lots more follows. I can’t comment on the veracity of this summation but my interpretation of it is that there may never have been a specific intention to include ballast specifically, instead the definition may have been expanded somewhat inadvertently. Who knows. Anyhow, the link is well worth a read.
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