Comment by JayStavis

Yeah, I think exporting a scene from blender as glft/glb, and then using these tools to bring your exported 3D file to the web, is one of the more approachable abstractions.

The reason you'd use gltfjsx (which that example doesn't) is to have fine grained controls for every node in the scene graph. In the case of the watch, this would map to having a component for each mesh or gear, which can be controlled with mechanics/physics.