In my experience, a vague or unclear request has never resulted in an acceptance. I understand editors want to give the writer some leeway and not dictate how the writer should write their story, but at the same time, writers aren't mind readers (Sorry, that's not a super ability you get when writing.) And it's often the case that I didn't interpret the editor's request the way they wanted it to be interpreted. Again, I'm not a mind reader! Also, interpretation is a frustrating process, more time-consuming than writing the damn thing, and when you receive the rejection, it honestly feels like a punishment for misinterpreting. Like this was your chance to save the story and in the editor's eyes, you failed.
When an editor can pinpoint where the story needs improving, that helps to open the writer's eyes and go: "Oh, is that what needs redoing?" Because let's face it, writers are often blind to their stories own flaws. For example, Sam Bellotto Jr. of Perihelion SF made this request for Mapping in the Darkness:
I truly enjoyed this story, but it needs a much more satisfying ending (not necessarily a happy ending) than the throwaway "Creepy" comic book trope of "EEAagghh!"
Please consider coming up with a more inventive conclusion and resubmitting the story.
Ah! Now I know what needs fixing. (And if you're curious about submitting to Perihelion, here's W1S1's interview with the editor.)
Another example, Brian Lewis of Spark: A Creative Anthology made this very detailed request for Spirit Flare:
More important to clarity of the story is much earlier mention of Spider Woman if you're going to mention the her at all, and perhaps at least a little snippet of the Hopi creation story and the Spider Grandmother's role in it. This is necessary to create a connection for those readers who don't know it—and most of Spark's readers won't know it.
For example, the conversation about the spider-shaped scar on Kasa's grandmother's should be a perfect point to say something. Grandmother could even launch into a retelling of the story, Kasa could respond dismissively by rolling her eyes (because she's heard it a thousand times and because she believes primarily in the modern world), and that would add to the justification for Grandmother getting upset.
Since the presence of Hopi ancestry and culture is, in fact, one of the things that set this story apart, I think bringing a couple more hints—but not overdoing it—of how that culture has continued into the future, even into space exploration, will really bring home the piece. (I even wonder if you missed an opportunity by not having Grandma refer to the pirates who left her with a scar as coyotes.)
The take-away from this is that if you're going to mention Spider Woman at the end as part of Kasa's change of heart, there needs to be more to help the reader make a connection to Hopi culture and religion, and these are just a few suggestions on how you might accomplish that.
Holy crap, actual suggestions! That's great! Not to mention it shows that the editor has a genuine interest in your story succeeding.
So I guess this is one writer's request for editors to be conscientious when asking for rewrites. The more clear and specific you can be, the more likely the writer will meet or exceed the editor's needs for the story.