Speaking from an architectural and engineering background... but why, though?

Sure, in some environments, that kind of architecture could work, but there are also very good reasons people still build houses with straight walls of studs and sheathing. Form needs to follow function, and this kind of design is much more about art than utility.

There is also the issue of strength. Most concrete mixes used today require rebar for rigidity, and the form in this picture would also require massive internal supports until the mass cures and while the surface finish is applied. There needs to be a sound reason to go to the trouble.