> The "not the thing I want you to respond to" part, I understand what you mean, but with some tinkering you could get it to match your usual typing/speech behaviours and cadence so that it doesn't start talking about the wrong thing before you finish your message.

I believe that you haven't actually thought about the problem. Your choices are, universally, respond sooner than desired or respond later than desired. There is no universal right amount of time to wait. There is no universal pattern to when your inquiry completes. So there is no universe where the machine responds only after you are finished and no sooner but also without waiting longer than it would take you to indicate that you want a response.