the effects of anonymity are more important for the anonymous writer than they are for the audience. We'd still be dotty over Jane Austen's books if, like her contemporary audience, we never knew her name.
The writing has enough authority and detail to carry us along in her inner world. Knowing her name, where she lived, and seeing the piecrust table where she painstakingly wrote out her manuscripts is interesting, but it's trivia. It's not what makes her novels sing.