I didn't say it is not excellent at writing text. But if you want to read well-written text, just open a book. The point is: how good is it at teaching you how

I didn't say it is not excellent at writing text. But if you want to read well-written text, just open a book. The point is: how good is it at teaching you how the language works? Like the grammar concepts, etc. I don't think it excels at that.