You're right, each medium has its advantages, but a medium of dimension n+1 can include the medium of dimension n. it is also true for post processing such as Photoshop and other rendering software, add some lights
remember that what you see on the 3D pdf is just an ... jpeg ... I allow your computer to calculate the rendering in different positions and / or animation (or I does not).
Each media has its time, one day when we will realize that the paper is so precious that it will end to the museum with the painting etc. ...
The trick is to adjust the precision (or the features) of your model to the user.
Do you think one day we will see cameras in 3d? in fact it already exists and is based on the technology of augmented reality, see the video
I sincerely think that technology evolves too quickly, but we are not, we must be aware, and that is the goal of the tutorial ...