Sorry to make a post about "why my question was closed," but I'm having a hard time understanding it.
The question about "uroboros" asks about two things: descriptive information about the history of that particular word's various pronunciations, and prescriptive advice about the validity of one hypothetical pronunciation that I give.
The question about "stigmata" asks for descriptive information about the history of that particular word's various pronunciations. The one answer that exists so far gives an explanation in terms of inflectional endings, which is completely inapplicable to the case of "uroboros." So "This question already has an answer here" seems to be false.
In theory, if they're duplicates, I should be able to edit the question about "stigmata" to make it about both "stigmata" and "uroboros". In fact, though, that would be a different question, and it would invalidate the current answer. So I can't do this in practice.
I don't see how the first can be a duplicate of the second: the pronunciation history of one word is not identical to that of another. So far, no answer has been posted that provides a general explanation.
I know that two people voted to close the question
because it is better suited for SE linguistics.
But, this doesn't explain how my question is off-topic for this particular site.
In any case, I just decided to re-post on Linguistics. But I'd like to know if similar questions about other words would be welcomed here in the future, or if they would be inappropriate or considered to all be duplicates of each other.