You could say this about many aspects of many foreign languages. So what? Reading explanations helps. Immersion helps too. They are both useful tools, and for

You could say this about many aspects of many foreign languages. So what? Reading explanations helps. Immersion helps too. They are both useful tools, and for many people, immersion or "the natural way" are not available unless they move to a different country, so reading explanations is a perfectly reasonable approach.