I don't get this at all. Central to the design of HTML and the Web is the notion of democratic access to information and the ability for non-specialists to create it. Furthermore, the motivation behind CSS was to make it easier to do this work by separating the design from the information. CSS should therefore be, if not intuitive, at least easy to learn, use, and troubleshoot.

It's true, we need brain surgeons to do brain surgery, but we shouldn't need specialists to do basic things like vertical centering, convincing layout without tables, and overriding styles in nested elements.

We've come a long way from the intent of CSS if we're arguing that only specialists should use it.