The creation of 3D content is complex, time-consuming, and — quite frankly — out of many people’s reach.
This is true for high-fidelity environments that people expect from AAA games or movie virtual sets, but it's not really true for the sort of content that Worldgen is producing. The effort required to learn low-poly 3D asset creation in Blender is definitely significant but it isn't out of many people's reach unless you have an especially low opinion of people. The Blender community makes assets like this stuff easily all the time.
This is true for high-fidelity environments that people expect from AAA games or movie virtual sets, but it's not really true for the sort of content that Worldgen is producing. The effort required to learn low-poly 3D asset creation in Blender is definitely significant but it isn't out of many people's reach unless you have an especially low opinion of people. The Blender community makes assets like this stuff easily all the time.