>>2952503
I can only speak to my experience in the field- some very high gloss porcelain does etch, it's gotten better but I've seen it happen a few times now. Simple household products or even my marble polishing compounds can bite. I suppose the question is whether the glossy glaze is actually porcelain too? Either way it happens without much effort on some material.

>>2952688
They aren't all outdated, but some previously ubiquitous varieties are now rarely used. Application of granite in very high end development is usually leathered or a pricey veined varieties. Most rich people/designers have shifted toward natural quartzite if they can afford it or solid, non speckled granites with deep leathered finishes etc.

There are many artificial stone/quartz producers now, they are now the replacement for subdivision or condo granite.