Depends on what you mean by counter productive. You wouldn't cite Quanta Magazine if you were writing the next journal article on this topic intended for peer r

Depends on what you mean by counter productive. You wouldn't cite Quanta Magazine if you were writing the next journal article on this topic intended for peer review. Instead, you would go to the original paper "Geometrization of the local Langlands correspondence" and pull that apart to look for ways you can improve upon what has already been done. But mathematics is a big area (there is a reason why it's a plural: it's better to think of it as more of a family of topics than a single science.) And if you're a mathematician from an unrelated branch of mathematics, an article like this is written in a way where you can understand most of the underlying concepts reasonably intuitively.