A natural-sounding voice massively increases our impression of a machine’s intelligence. The downside of this is that it raises expectations on behalf of the user, potentially leading to conversational failures and frustration.
As humans, we establish an emotional connection with all products we use. Therefore, we expect some level of human-like feedback when we interact with products. Even though we know that the products aren’t humans and can’t feel emotions, we want to believe that they can.