Yeah, that and if you can easily take it off its stand and use it as a tablet, someone (perhaps even you) will do just that, and leave it in another room. You'll be in the kitchen wondering how many grams of tapioca starch you need to make Pão de Queijo, and you realize that your Alexa is on the bedside table, or maybe in the magazine rack by the toilet.I was thinking the same thing - I'll bet the big difference is in the microphones to pick up your commands across the room and/or filtering out extraneous noise to hear your command.
I expect I'll eventually have Alexa, or more likely a Siri speaker, in every major room of the house, so I don't have to worry about where I left it.