It's like an electric car
Yes, there are plenty of times when a NexDock2 and a Samsung phone, with their limited capabilities, are sufficient to work productively. But there are enough times when you need a proper laptop, so you might as well get one and save yourself the hassle.
Yes, there are plenty of times when an electric car, with its limited range, is sufficient to get you where you're going. But there are enough times when you need a normal car with longer range, so you're probably better off with a normal car.
As the original review of the NexDock2 pointed out, for the same money you can get a decent second-hand laptop. With a UK keyboard.
I'll get my flameproof coat.