Digital BW, The Print

Hi,
in the shower this morning, it occurred to me: why doesn't Epson use low-gamut pigments, as manufacturers like Cone do, to make the K/LK/LLK inks neutral - so that when printing BW, we are not balancing the warm carbon pigment with the less stable high-gamut coloured pigments that their coloured inks use? The high gamut pigments would then only be needed in BW printing, for toned prints, or balancing the tone on differently toned papers. 

I can't see what downside there would be in producing perfectly neutral black ink, with neutral dilutions. I can't imagine what downside this would have for colour printing, either.

Any thoughts anyone?

Richard
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http://www.richardsmallfield.com