Implicit in the human to human to AI conversational chain is the second person’s assumption that the first person didn’t think to ask AI.

The mere fact of asking another human a question (absent a strong pattern of behavior to the contrary) should be strong evidence the interlocutor wants a human answer! Sending an AI answer should have the same social valence as sending a lmgtfy link; appropriate for bad actors but a pretty insulting response to an earnest question.