My main use case for voice is for things that I haven't been able to (reasonably) automate. For a couple of examples:
- Saying "turn on the TV" as I'm grabbing lunch and walking across the room
- "Turn on/off the stars" for bedroom mood lighting
- "Timer for x" is honestly probably the most used things.
It's all fairly trivial stuff to do manually but I think that's probably true for the vast majority of home automation.
This is the answer. I've had to build it a handful of times and it always feels bad.