Not sure what you mean that "css is hell", although I understand from working with a lot of programmers (I do front end they do back end) that CSS is seen as so

Not sure what you mean that "css is hell", although I understand from working with a lot of programmers (I do front end they do back end) that CSS is seen as something you might also want to learn but not really because it isn't proper programming. CSS as it is now is incredibly powerful and works almost as it should (almost int he way all languages/technology are works in progress). I can see this (GSS) as having its place amongst a developers list of tools, but ultimately I can't see how it is better than Flexbox, or why I would want to a javascript library to do layout, or who in their right mind would want to pass a project using this on to someone else.