I love questions about etymology (in the sense of the origin and evolution of words and phrases) because, often, researching them yields such surprising and rewarding results. In my experience, a well-researched answer to an etymology question on English Language & Usage is likely to be considerably richer and deeper than the more narrowly focused answers that Etymology Online provides. This isn't a knock on Etymonline; it's an acknowledgment that space restrictions require that resource to take a narrow view of what identifying the etymology of a word or phrase means.
In contrast, EL&U can accommodate multiple instances of early occurrences of a word or phrase, along with discussions of the context of these occurrences, and coverage of evolving meanings (if any). Taken together, these components of an answer can help make it a legitimate original contribution to popular understanding of the origin of a word or phrase.
The problem is that some linguists and language enthusiasts seem to think that etymology is properly limited to identifying the root words of—or the progression through other languages of the antecedents of—the word or phrase in question. For them, Etymonline's coverage resolves the question of etymology insofar as etymology is on-topic at EL&U. Hence the frequent comment made to posters of etymology questions, "Did you check at Etymonline? What did you find?"—as though that site's coverage were conclusive and exhaustive.
I take a different and much broader view of what "etymology" encompasses. Since we don't have tags at EL&U for "word origin" and "phrase origin," questions that inquire more broadly into the circumstances surrounding the emergence of a word or phrase into its modern sense in English tend to use the "etymology" tag, though they may seek information about early occurrences and early meanings of the word or phrase, in addition to its etymological derivation, narrowly understood. In effect, they are requesting the kind of early usage coverage that the full OED provides in its historical citations for a word—and today, happily, inquiries into such examples often turn up earlier occurrences than the print OED has recorded because they can take advantage of searches of digital libraries.
For inquiries of this type, Etymonline is merely a starting point. I would welcome any question about etymology (in the broad sense) that began by saying, "Etymology Online reports that word [or phrase] X comes from bar-bar-bar-bar. What (if any) significant information about the etymology [or origin or emergence into mainstream English] of this word [or phrase] does Etymonline's account omit?"
I do not favor trying to sequester questions of this type in a special reserved area of EL&U. To the contrary, I think that such questions should remain integrated in the core of EL&U, not least because I think that they produce some of the most useful contributions that EL&U makes toward broadening public knowledge of matters of English language and usage. What I would urge is that site participants who currently take a narrow view of the proper scope of "etymology" consider adopting (or at least accepting as legitimate) a broader notion of what that term etymology encompasses on this site, and try to take a more welcoming (or at least tolerant) attitude toward questions and answers premised on that broader interpretation.