In this case, their procedural generation system they created, and are using in Zenith: Infinite Realms to bring together more content, faster, but still keeping the human involvement and refinement.

Unity’s Procedural Building Builder now allows rapid creation of varied low‑poly buildings in the editor or at runtime through controlled profile systems. It supports optimized meshes and consistent ...

It’s not uncommon for games to include as much content as possible in an attempt to keep you hooked for dozens, if not hundreds, of hours. But for most games, that well of content will eventually run ...