My question might be related to English, not Klingon, but how is "be
glossy" [new word {chorgh}] different from "be shiny" [old word {boch}]?

The request was "have a smooth, silk-like, reflective surface" and I
think that a shiny blade, which is {boch} does have such a surface. So
what's the point? Was maybe the requester not aware of {boch}?