Two types of short story, each modeled in Eisenberg's collection

Some short stories feel almost like novels in miniature, and in fact we sometimes read these stories and think, yes, this should be, or could be, expanded into a novel - but if the story truly works there is absolutely no need to do so. Here I'm thinking of stories in the realistic-narrative tradition, by such authors as Chekhov, Munro, and Trevor. (Not to put myself in their company at all, but I once presented a story to my writers' group and the overall suggestion was to expand it into a novel, about which I felt that if I did so I'd look back and say that it's basically just a short story; I never expanded it, but it was never published either so they were probably right.) Other stories seem to be exactly of the right length as is, w/ no possibility of expanding w/out doing damage: Here we think of experimental/avant garde writers, such as Borges, Calvino, Coover, Barth, Saunders maybe, and also those with "open" endings, e.g. stories of Joyce, Cheever, Updike - realistic, but not conventional narratives. Deborah Eisenberg concludes her brief collection, Your Duck Is My Duck, w/ 1 of each type: The Three Towers is a weird, dystopian story about a woman hospitalized because of a strange malady through which she sees multiple meanings of words. It's hard to imagine extending this story to novel length; however, I could imagine a film adaptation, as we gradually realize that the woman's supposed ailment is actually her use of imagination - a malady in the face of the bland commercial world (future) in which she lives. Many odd details - such as her journey by train into the city where the hospital is located - could play well in a movie, albeit not a movie w/ huge box-office upside. The final story of the collection, Recalculating, is far and away the most conventional: The story of a young man raised as the youngest son in a Midwest farm family who travels to England for the funeral services of his oldest uncle, who has been completely alienated from the family; he learns of his uncle's successful life and of his circle of artistic, omni-sexual friends in London, a visit that changes the course of his life; yes, this one could be expanded into a novel and, unlike all the other stories in the collection, it's told in straightforward chronology though encompassing wide gaps in the time sequence. But why should it be expanded? The story covers a lot of time and a long span of life with economy and concision: Leave as is.