What are the benefits of first-person narrative in telling the story of "The Yellow Wallpaper"? In what way was it able to address societal problems through this point of view?

Having "The Yellow Wallpaper" narrated by a woman who is infantilized by her husband and brother deepens the pathos of the story. She speaks from firsthand experience about what it is like for women to be prevented from enjoying essential human freedom and to have their concerns and interests dismissed as illogical and unimportant.
The institution of marriage in general comes under fire in the story's opening, as the narrator observes, "John laughs at me, of course, but one expects that in marriage." This offhand remark speaks volumes about how little respect the narrator feels that she can plausibly expect from her husband.
Though the narrator wants to pursue her interest in writing, she is "absolutely forbidden to 'work'" by her husband, who also happens to be a doctor. His natural assumed authority as a male is intensified by the status of his profession. It places him in a paternal position, and the narrator's brother is also a doctor. It seems apparent that even if the narrator were able to escape the control of her husband, her brother is not likely to be of any more help to her in her desire for self-determination.