Seeing the information on screen is good because once shown it’s there till you remove it…so you can rescan the info, or pause to consider it. Also you remember the visual info better for later reference, you just save the picture in your head. Doesn’t work that well when things are spoken to you.
But, to get that visual info, you need to be in front of the screen, looking at it. Where as you can be anywhere in the room, in any orientation to hear what Alexa said!
What Amazon is going towards is a world where screens become ubiquitous, every surface is a screen, ur fridge door, the back of your main door and maybe the ceiling too!