One of the most interesting use cases so far has been in education, where the low learning curve provides a frictionless experience in studying design as well as materialising one's ideas. Thus, lowering the barrier of entry for younger creators. (Another developer here)
3DC enables anyone to start creating in just a few minutes. No previous professional 3D experience needed. It's designed like LEGO for the digital world. By combining the primitives, one can start fast and gradually come up with ever more complex designs.
A lot of people build and sketch prototypes. There is basic constructive solid geometry via the subtract tool for some more complex stuff. As for textures, we will be adding them in the next update.