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_This is one of four (or more) alternative answers._  

_(I am posting the alternatives separately and simultaneously to allow separate voting and commenting.  They represent elaborations of potential courses of action touched upon by comments on the question post.  Comments on the answer post can now be used to refine the respective options further; new parallel answers are welcome, too.)_

# Option 4 - Status quo

"Languages" and "Linguistics" aren't separable categories.  "Linguistics" is the study of language, studying both tiny traits of tiny languages, as well as big questions involving many languages; "linguistic" is the adjective corresponding to "language" without any obvious further semantic difference between the two.

There's a lot of gray area between a super-specific question such as "what is the origin of this particular word in this particular language", and highly generalized questions about languages at large.

We don't need a mechanism, or we don't know how to establish a consensual mechanism to draw a red line between "Languages Q&A" and "Linguistics Q&A".