Yeah.. because that's what people think when they see OS X.. uniX .........
[ReactionToSarcasm] Nope, they don't, but it OS X is simply nice name, OS XI looks, IMHO at least, awful... It's something like with Adidas. Should they increase number of stripes with every collection they create? Because that's something similar. Product name (Mavericks, Snow Leopard ...) is there for customers and version number ( 10.9, 10.10 ...) is for developers to distinguish each version. Microsoft also doesn't have Microsoft Showcase instead of Windows just because it is bigger ( and some people assume that bigger = better) ...