The version was useful when the browsers had incomplete support for CSS. It served as a milestone for browser makers to achieve. They could give a claim of thei

The version was useful when the browsers had incomplete support for CSS. It served as a milestone for browser makers to achieve. They could give a claim of their technological advantage, say 90% of the CSS3 features. Now the CSS progress is more driven by the browsers than the W3C committee. Also, CSS does not affect the competition between browsers as much as before. So, as the flashy tech gets stable and boring, the need to give it marketable names goes away.