The web is ever changing and nowhere else is this felt more strongly than in the web stack. HTML seems pretty stable even though many web developers seem to be ignoring the enriched HTML5 spec. If it doesn’t have a specific visual rendering why use it? It’s effectively a div anyway, right? If you don’t care about the markup you’re probably not a front-ender.
Now, some seem to have missed it but CSS has been on a bit of roll the last few years. Transforms, transitions and more selectors you can shake a stick at. The addition of pre-processors has made it less unwieldy and concise, a developers dream. With the whole (Twitter) bootstrap thing making sites and a application became considerably less painful. Somebody else has done all the leg work so we stick CSS back in its box. Abstract the knowledge away and we can all live full and productive lives. The thing is that this almost never true, there is always, at the very least a tweak and a polish required and readymade GUI’s only get in the way. It’s the bad old days of (web)application frameworks like JSF all over again. If you think you need to abstract CSS away then the odds are that you’re not a front-ender.