Typically, a short story which is identified here will have appeared in several different magazines, anthologies, or collections, and the text may (or may not) vary slightly or considerably from one publication to another. In answering a story-identification question (or any other kind of question) with quotations from the text, how important is it to specify the exact edition being quoted? Is it mandatory, or is it optional, or is it considered noise? If the answer is that it's mandatory, does that mean we should revise our old answers with imprecisely attributed quotations?
When there are relevant differences between editions, please specify which one you're using.
Can Molly Weasley apparate? is a good example of a question in which the answer depends on a quote which appears in one edition but not another of the Harry Potter books, both editions being very widespread. So the answer should specify which edition is being quoted from.
If the OP of a story-ID question specifically remembers a scene which was in one version of the story but not another (hypothetical, but you may have a concrete example which inspired this meta post), then again a good answer would specify which particular version is what the OP is looking for.
In general, specifying which edition you're quoting from is recommended but not mandatory.
Unless you own two editions of the same book, or you happen to be an expert on all the different versions of it, you probably won't know how much they differ from each other and whether the differences are relevant. So to be on the safe side, it's probably best to specify which edition you're quoting from, just in case there do turn out to be relevant differences which you weren't aware of.
But making this a requirement would be a massive pain for a lot of people and cause more problems than it solved. I suspect most people (including myself) own a copy of a book without knowing what edition it is, or how many editions there are, or how specific they need to be to ensure there's no ambiguity. Forcing people to specify edition every time they provide a book quote in an answer would make people afraid to provide quotes, which would lower the quality of answers. Let's not go there.
And finally, just to remind everyone how important these between-version differences can be ...
Han shot first!