Losing nuance is a cost to the writer, but a benefit to the reader. The really nice thing about having fixed categories is that they form a set of fixed reference points allowing us to compare articles. This then allows the user to more quickly determine whether an article is or is not relevant to their interests. It also allows the LessWrong (or GreaterWrong) software to implement filters, which allow this sorting to happen automatically.
Losing nuance is a cost to the writer, but a benefit to the reader. The really nice thing about having fixed categories is that they form a set of fixed reference points allowing us to compare articles. This then allows the user to more quickly determine whether an article is or is not relevant to their interests. It also allows the LessWrong (or GreaterWrong) software to implement filters, which allow this sorting to happen automatically.