Yesterday I gathered some willpower and began working on a long awaited (by myself, at the least) style unification in highlight.js. Here's the first taste of why I think it is important.
Let's take one of the recently added style — the "Android Studio" — and see how it displays two config languages that happen to not count as "hot" these days: Apache and .Ini:
To fix this particular case I had to define semantics for classes "section", "meta", "variable", "name" and "literal", and dropped all the Apache- and .Ini-specific rules from styles.
Here's how it looks now, nice and consistent:
There's a looong road ahead but after it's done designing a new style will be a matter of using a relatively short list of well-documented classes with a good guarantee that all languages will look decent.