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"Research-level question" = looking for research level answers, citing articles, giving an overview of articles/subfield, instead of repeating textbook/Wikipedia type knowledge and basic clarification.
Shouldn't this be clear from the phrasing of the question?
How do you want to differentiate? If you need a "research-level" answer, just state that in the question.
Maybe it is implicit: Research level questions require research level answers.
Let's just create a research-level tag then?