Re: [w3c/webcomponents] Support Custom Pseudo-elements (#300)

> Zero-arg mixins are convenient, but all the real useful mixins, in my experience, use arguments; you can only do pretty simple things with zero args

True, but I still think there's an argument to be made for theming with `@apply` since it works across both components/shadow roots and light DOM (vs. using classes for light DOM and `::theme` for components). 

Without `@apply` I imagine a lot of people (myself included) would fall back on mixins from their pre/post-processor of choice to achieve that kind of thing, so I guess the question is whether that should be baked into the platform or left to tooling?

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