For example, a while back I was using Assistant to look up showtimes for a movie at a specific theater, and just to see what would happen I said "show me a map" without giving any explicit context. I was expecting Assistant to come back with a search query or maybe pictures of generic maps in response, but to my surprise it actually understood that I was talking about a map of the theater and gave me that.
Of course, that specific response in that exact situation isn't in and of itself all that impressive, and for every time Assistant succeeds in figuring out what I meant in a situation like that there's maybe one or two other times when it has no clue, but the idea of being able to speak 100% naturally to a virtual assistant and having it "just work" is unbelievably cool.
But that's not really an inherent issue with voice. It's just that today's systems are mostly stuck with requiring relatively strict adherence to specific syntax. This will certainly improve over time.
I don't find Alexa as transformational as some people I know do but I find it useful enough.