I don't see them as imperative - but that may be a professional point, since "Tell me about ..." is the preferred form of open-ended direct examination questions.
As to why the format is used, it's because this way avoids having informational content thrown into the question. So the PC can ask about a topic without having to offer up any information. This avoids having to personalize the PC.
"What do you know about...?" and "What can you tell me about...?" would achieve the same result, albeit with slightly more words (and I'm aware there's a word budget, so this "Tell me about...?" design might have been chosen because of its economy).
I also don't think it's possible for questions to contain informational content. If I ask whether A is B, I've revealed nothing at all about whether I think it is.





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