Default camera position not changing?

A new camera is indeed created, leaving the original one unchanged. The scene graph is also unchanged. The new camera is not part of the scene graph and can be accessed with scnView.pointOfView

A new camera is created, leaving the original one unchanged.

If you show the inspector using the showsStatistics property, you'll notice the Point of View changes from the camera you had (even if it is "Untitled") to kSCNFreeViewCameraName.

Sadly there is not much documentation about this behavior but you might be able to find it in the node hierarchy.

Let us know what you find!