I’m a quad, so I follow voice command technologies carefully.
I really prefer totally hands-free, but Thankfully I don’t have any cognition issues, so I can use somewhat clunkier methods, including those involving hashtags.
Right now, the most practical for me is one worked out by will Poirier. It uses IFTTT as a “man in the middle” protocol. That way anything that can send a text message that includes a hashtag can trigger multiple smart things actions.
I use mine with “hey Siri” on an iPhone and an iPad. I also intend to use it with Apple’s watch.
You have to remember to say the #, which is a little inelegant, but it works.
I use “Hey Siri, tell home #Bedtime,” for example, to turn off lights in several rooms.