I think CSS is a very powerful language for designing both a document and a user interface. It will not go away soon, so learning CSS as a designer will be a good investment.
- It's that, the notion of HTML/CSS is being considered to be entry level knowledge, so you can diminish its value/quality and to have a front-end job, focus on Javascript Framework-XYZ and disregard their significance yourself.
With that said, some people are just meant for more of a design/visual front-end dev, and some are more in it for the code.