Here's the thing about your laptops. They are large, heavy, loud, and hot. While they do have more performance than a Samsung Galaxy S7, it's really not by much, and it won't be noticeable to this products target.
This product will let people perform productivity tasks using a device they're probably carrying around with them anyways, and a keyboard/display/battery combo that will be light, thin, quiet, and cool. Not only that, they won't have to throw it away when they get a new phone, and the performance/features will just keep upgrading as the phones evolve.
I think this is a damn good idea. Why buy a smartphone AND a laptop that you will have to end up upgrading both?