Marcellus, thank you for the response. For me, discovery means getting exposure before the user has intention to use your service. This is equivalent to browsing in a store, without knowing what you want to buy, then you see a shiny pen and want to buy it.
When you say, “I want to play tic tac toe,” you are not in discovery, you have a clear objective (equivalent to going to a store knowing that you want to buy a pen, but do not know which pen yet). You have an intention, and want an answer.
Voice platform IMHO is not good yet at the browsing part. It can give you an answer when you ask a question, but if you do not even know the question to ask, it won’t help you much.