I personally find the "Living Standards" from WHATWG difficult to use. Specifically keeping track of what has changed with things like what new HTML elements ha

I personally find the "Living Standards" from WHATWG difficult to use. Specifically keeping track of what has changed with things like what new HTML elements have been added. With the versioned standards, I can work towards supporting that and I know that the standard is in a stable state with known backward compatibility guarantees. How is CSS not versioned? CSS may be complex and have a lot of baggage, but that is what happens with any language that grows and evolves over time. I don't see how that relates to giving CSS editors job security, especially given that they are doing a lot to provide modern and advanced capabilities in a way that is implementable and addresses users needs. XML and RDF may be irrelevant to you, but they are not irrelevant to everyone.