[QUOTE=Frylock]
Say the advisee has written a research paper to turn in as his final project for a course in English Literature. In the middle of it, you find the sentence “But that ain’t the right interpretation.” Elsewhere you see “There’s a bunch of stuff I haven’t talked about yet.” I imagine you would advise him to leave out “ain’t,” and you would caution him against “a bunch of stuff.” But would you really be advising him against these usages because they are “not to your taste?” I doubt it–I think you would advise him against these usages because you know they are inappropriate* for the kind of paper the paper is supposed to be. This is not a judgment of taste–it is an attempt at a judgment of an objective fact. (I.e., the objective* fact that certain usages are appropriate in certain contexts.)
What kind of rule is “Usage X is appropriate in context Y?”
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[QUOTE=Indistinguishable]
And what strikes a Californian as normal in an informal register might also seem out of place to them in a formal register. But those are still examples of rules of this sort. Even a thing like “don’t say ‘ain’t’” is a rule of this sort, accurately describing the speech of many communities, perfectly valid as long as one keeps in mind its proper scope and the fact that there are many other speech communities where it doesn’t apply.
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You are correct that that is what I would do. But these are rules of type 1, we can derive them from common usage for the formal written register of an academic research paper; the general community of people reading and writing such things would actually be following these rules already in that context, as opposed to the various sorts of prescriptivist rules from category 2 which I’ve referenced, which people only follow now and then when it pops into their head to think to do so or in response to remarks from an editor who’s been trained (for no good reason) to have these rules pop into their head. When you violate the rules of type 1, the readers you are addressing are bound to notice the jarring deviation from the expected style. When you violate the rules of type 2, not so much (because these aren’t actually normally naturally followed; if they were, we could observe them as common usage and they’d be of type 1).
And to reference the OP a little, I really don’t think you’d find “alright” to be rare compared to “all right” in academic literature, certainly not enough to make it jarring to read or condemnable to write.