Annnnndd... the device in the OP doesn't? It needs a powered USB port and some
sort of monitor at a minimum. Not to mention a keyboard and a mouse (BT or otherwise). Where is one most likely to find such items?
I know some TVs have USB ports on them. Mine does. Kind of a smallish niche market though, don't you think? How many TVs are you going to find to plug into? I doubt the local coffee house will look kindly on you taking over their TV. And you have to bring a keyboard and mouse with you besides. Should have just brought the laptop in the first place, eh?
I guess I could plug it into the HDMI port my phone. But it still needs power. And my phone already runs Android. Pfff.
I'm just not seeing anything here to be excited about.