[MikeTV]

The only killer use case I've encountered so far is being able to yell "hey Cortana! Next track!" across the room while playing with a toddler, since either walking over to push a button or pulling my smartphone out to advance it remotely would totally disrupt the current interaction with my child.

Or I could just curate my playlists more carefully.

Everything else is either too low information density (this is why I get the weather from an app, not The Weather Channel) or more efficiently handled manually (music control, search queries) in most situations