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Cgtrader standards / glass

Hey guys cgtrader says that for a PBR workflow I should upload at least: BaseColor Normal Metalness and Roughness. And in case of a glass material I should add an opacity map. This I don't get. I usually make my glasses with refraction maps in Vray with ior and other options, but why doesn't cgtrader ask for a material like this? Isn't the opacity channel not enough for glass' shenanigans? Thanks a bunch 

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