This was discussed back before we had ceramics in the game...
The basic problem is, there's no real reason to use bone china in place of true porcelain, or for that matter, porcelain in the place of other forms of ceramics.
In fact, there's no reason to use ceramics at all without magma kilns, because fueling the kiln will take a unit of charcoal that comes from a tree that you might as well just carve into wood crafts for the same purpose.
Part of the original idea for porcelain was that it would take multiple units of charcoal and require a mechanically powered fan to blow more air to burn hotter than magma can actually burn. Porcelain when it was put in-game, however, is just a way of turning semi-rare kaolinite into a slightly higher value ceramic object.
Or in other words, like with many objects that realistically were a part of historical society, there is no reason to replace anything that can be made with wood, stone, metal, animal parts, or other objects we already have in overwhelming abundance. The game can't differentiate any of these items by anything other than raw value, and we have the ability to create freakish amounts of raw value already.
The only way you're going to create a place for these sorts of items is to create a demand for these sorts of items, first. (This was, in fact, the original purpose of Class Warfare - to make dwarves demand all sorts of fancy things when they got rich so that fancy things had a reason to exist. Only then can making a fancy thing involve more steps than making a simple thing be justified, as a simple thing will no longer suffice.)