Why A Worn Path is Eudora Welty's best-known story

Poked around a little yesterday looking up Eudora Welty on Google and noticed a few pages citing A Worn Path as her best, or most famous, short story, so went back in her "Collected Stories," which I'm reading, to re-read A Worn Path - I think I just skimmed over it earlier in the volume and didn't post on it at the time, not sure why - anyway, I can see why it's a famous story but not sure it's her best - it's famous because it's relatively short, easily anthologized, very teachable - also a very good story that, like many of Welty's, is simple on the surface but conceals a lot of significance. Well, actually not all of her stories are so simple on the surface - some, particularly later in her career, require a lot of work. Not this one at least superficially: an old black woman, Granny, walking a difficult path from her country home to the city (Nathcez), we don't at first know the purpose of her journey - in Natchez, she goes to a hospital where they provide her, grudgingly, with some medicine for her grandson, and she sets off to return, stating she will buy him a little toy with a few coins that the hospital staff gave her. Superficially, it's a story of her love and devotion to her grandson. On a deeper level, it's about the whole perverse nature of Southern, and American, society at the time: the obvious incredible poverty of this poor woman, and a health-care system that will do nothing but provide her with a bottle of medicine, and then proudly writes that off as "charity." Also, the sense that it's OK to consign her to the margins - she's threatened, jokingly and mockingly, by a hunter she meets on the journey, and just never really treated as anything other than a cute and quaint old lady - to a degree, even Welty is guilty of this, in that she doesn't really let us see Granny as other than a type - as noted in other posts, black people of the South never emerge as true characters in her (early) fiction, and this portrait of Granny becomes for many an indelible picture of black Southerners of the time - but read some of the Southern fiction by black writers, for a contrast, who show black people in the fullness of their lives and their aspirations and their struggles against racism - imagine how Zora Neale Hurston or Jean Toomer would have portrayed Granny, not as a type but as a rounded character. Finally, however, there are obvious allegorical elements to the story: woman goes on a journey, faces obstacles, attains her goal - a journey of life and salvation (at least that's what we'd say if this were a Flannery O'Connor story).