Eh. I guess I don't see a problem with how the language works here. "Correction as question" probably takes longer but if people are getting confused by the process then I consider that a weakness of the particular implementation.
For example:
Your challenge is that this is now ambiguous with regards to whether or not I know the answer. Except, the point isn't what I know. The point is that there is a contention of each+are and the two separate goals of "teach correct grammar" and "learn correct grammar" can move forward in the conversation:
If you needed to know the answer, you got as much information as you could from this speaker. If you have questions you can continue down that path.
If, on the other had, you happen to know the answer, the conversation now forks into a direct confrontation:
So, other than the inconvenience of having to insert a few sentences into the conversation, we haven't lost anything. There isn't any ambiguity and this transition was much smoother than simply saying:
There are plenty of reasons why phrasing the correction as a question is helpful — your point (as I understand it) was that the ambiguity between "correction as question" and "query for information" makes the former not worth it. My counterpoint is that the ambiguity isn't a necessary component of "correction as question".
For what it is worth, I am mostly thinking of corrections that are not direct claims of fact. For instance:
I don't see any advantage to responding to this with a question and, personally, favor the more direct approach:
If I felt obligated to take the less direct approach, I would do as such:
This can stall out if the other person doesn't offer anything useful in response. (And, by the way, Swedish is the official language according to Wikipedia.)
Also of note, this all changes depending on who is making the mistake. If I happened to be talking with someone I knew favored a direct approach, I would just point out the error because they are more likely to consider that polite than beating around the bush.
The sequences cover the virtue of admitting you've made a mistake. We all make mistakes and when we do we ought to say oops and move on. I was taught this at an early age and I grew up in an environment where admitting error had no social stigma and where correcting somebody (even in public) was commended. Good times were had by all.
Needless to say, I eventually came into contact with the real world and I had to change my behavior. For instance, correcting somebody's pronunciation used to result in immediate repetition of the correct pronunciation followed by "thanks" and the discussion would continue without interruption. Or just a simple nod to acknowledge the correction. In the adult world a correction results in an annoyed look or a glare instead.
So it turns out that some people, highly intelligent and intellectual people, seem to be completely unable to admit error. Even when it concerns a trivial mistake, such as getting a factoid wrong, the best response I can hope for is a grunt of acknowledgement. I'm not talking about uneducated or intellectually insecure people here.
Okay, so a lot of adults don't appreciate being corrected. Duly noted. I could move on, but the virtues of scholarship and curiosity compel me to find out why. Predictably Irrational (Ariely) and Influence (Cialdini) don't have the answers. My non-scientific experiments indicate that prefacing a statement with "That's wrong because..." doesn't work. It seems to make people extra defensive. Standard strategies of persuasion do work, of course. Rephrasing the correction as a question? Works. Saying "Hmm" and pausing before you correct? Works. Making a suggestion that indirectly points out the mistake? Yep, works. These are all standard strategies of persuasion and they can be used to work around the issue but they don't explain why it is that some people have such an aversion to being corrected in the first place.
So where does the aversion come from?
In a group context signaling could explain it: when you correct somebody you draw attention to a mistake and this could lead to (perceived) loss of status. I don't think this is the real cause because people seem equally annoyed when corrected in a private conversation where there is nobody to signal towards. In cases where signaling takes a dominant role (e.g. when a bunch of guys are talking and a woman joins in) you clearly see a change in behavior because the guys wish to be perceived in a specific way. So in some groups signaling effects can make it more difficult to admit error but signaling is not the underlying cause that makes people averse to acknowledging mistakes in the first place.
Maybe it is an issue of ego. Is a correction seen as the role of a teacher thereby forcing the other in the student role? That would explain the aversion, but if that's the explicit thought process otherwise rational people would see it doesn't make sense and change their behavior accordingly. So there can't be an explicit (tactical) thought process underlying the behavior at all!
Maybe people don't wish to admit their mistake because they prefer to keep it all ambiguous. By admitting a mistake they know I know that they know they're wrong (youtube). This feels like the most plausible explanation, even though the explicit admission of the mistake does not change the state of the shared knowledge: the situation wasn't really ambiguous to start with.
So then I'm forced to conclude it's some knee-jerk, gut level aversion to being corrected that has no underlying logic or motivation. I cannot even begin to comprehend this. Given the effort required to find and correct (cognitive) mistakes how can we feel anything but gratitude when somebody points out where we go wrong?
Can somebody who has (or had) this aversion to admitting mistakes explain it in terms I can understand?