same questions, and same doubts.
i myself turned it on two macOS generations ago, for about 1 day.
was useless to me.
maybe its likely Siri would understand me better in these later generations of it, and probably with Siri having a more integrated knowhow to where / how to access various kinds of data. most likely.
even in iOS i tried to use it, but didn't like it. maybe with wireless AirPods. but can't see myself using it.
i find keyboard input the easiest and quickest. even in iOS.