Help desks and canned replies - if a user complains about X, respond with Y. We used to just have humans do it, but turns out machines can do that bit, too, especially if the question is relatively simple or asked a lot or has an answer not up for debate.

I assume if they copy pasted the same question it could have been cached? It would seem wasteful for <llm_provider> to not cache responses to exact same questions with exact same context windows (fresh session).

I'm just speculating though.