Giving a little additional information yourself that was not asked for has another effect that you don’t mention, or maybe it’s what you mean by (1): It tells the other person that they are expected to answer your question with at least the same level of detail, i.e. it signals to them that they will not be impolite in doing so.
Giving a little additional information yourself that was not asked for has another effect that you don’t mention, or maybe it’s what you mean by (1): It tells the other person that they are expected to answer your question with at least the same level of detail, i.e. it signals to them that they will not be impolite in doing so.