If a specific rock with specific characteristics from a specific area I have no problem as I mentioned. What I said was I disagree with giving multiple names to the same material from the same location.
As for jade there are many forms. Nephrite and jadeite, which sub-categories such as white, jade, black jade, lavender jade, etc. Just like there is precious opal and common opal with many sub-categories such as boulder opal, jelly opal, Ethiopian opal, etc, etc, etc, with about 300 forms of opal. So we do have to differentiate DIFFERENT materials from DIFFERENT locations. We don't give dozens of different names for BC jade or dozens of different names for Mexican jelly opal from the same location when it is all the same material.
As for porcelain jasper this is a specific characteristic of some jaspers, not a locational name. As I mentioned before porcelain jaspers are very fine grained jaspers that due to their characteristics take a very high polish. I have quite a bit of it laying around here. Is the name over used as a sales tool? Yes. As is making up a bunch of exotic names for the same material to make it appear different and less common. As an example Tiffany stone, which is also called "opalized fluorite (misleading term since fluorite does not opalize), ice cream opal (again misleading since it is not opal), bertrandite (misleading because this mineral found various places around the world may or may not be present in the stone due to ultra low level of presence), etc.