A quote from Jeff Atwood since you think I misinterpreted it: From this point on, meta-tagging is explicitly discouraged.
How can you tell you’re using a meta-tag? It’s easier than you might think.
If the tag can’t work as the only tag on a question, it’s probably a meta-tag. Every tag you use should be able to work, more or less, as the only tag on a question. Meta-tags, like [beginner], [subjective], and [best-practices], are useless by themselves — they tell you nothing at all about the content of the question.