Your terminology and reasoning are very mixed up here. Your argument that "WebGL is not a 3D library because you have supply the 3D knowledge" is complete nonse

Your terminology and reasoning are very mixed up here. Your argument that "WebGL is not a 3D library because you have supply the 3D knowledge" is complete nonsense. For one thing, WebGL is not a userland "library", it's an API layer on top of device driver implementations of the OpenGL spec. It's not designed to be something that "makes 3D easy"; it's not even a "library" in the npm/jQuery sense of the word. I would not recommend any tutorials written by an author whose reasoning about OpenGL is so fundamentally flawed. You should really re-think what you're claiming here.