In all of these demos, they never show you the resulting bathroom, shower, or kitchen. It's always "here's a shell we made". I'd like to see the finished house, with fixtures in place and working.
While am generally a 3d printing skeptic I feel it's not quite a fair take. The bulk of a house (and its major cost component) is the structure. So this could be useful even if it can't print you the bathroom and the fridge. How well it going to work in practice is another matter (and here's where am skeptical).
Using current pre-fab techniques a half dozen builders can raise the core structure of a single family house in a few days. A friend of mine is in the process of building a house and raising the core structure was the fastest and easiest part of the whole process. I don't see this being either cheaper or faster.
The bulk of the cost in many cases is things independent of the actual house, like purchasing the land, doing the ground work and the foundations and pulling in water and sewage.