The difference is voice does not have to be a replacement for a button but just another option. My light switch in my bedroom is on the other side of the room t

The difference is voice does not have to be a replacement for a button but just another option. My light switch in my bedroom is on the other side of the room to my bed and if I'm falling asleep it's much easier to give a voice command than get out of bed and press a button on the wall and then fumble back to bed in the dark. Not to mention when you notice you've left a light on in the hallway/another room. But I also have my lights on a button on my remote and yes, often it's easier to just press that.