The elements that the animator Jiri Trnka used in his animations demand the uses of stop motion because in order to maintain the realistic textures without the use of a video camera for the animations entirety he needed to use inanimate objects in reality. This is a unique property of stop motion animation. It also gave him the ability to ignore the limitations of a live action. Some movements he uses in his ‘Hand’ video was a bit unrealistic such as the human hand acting as a person or when the hand appears to be floating around in some instances. I did however see some evidence of ongoing video segments in this piece. An example is where the man was spinning a clay pot. The movement was very smooth so I think that the scene was from a video.
Some inanimate realistic objects float around like it as a mind of its own. This can only be done in stop motion animation at this point in time.
The light and shadows is real and it moves with the figure and maintains its volume throughout an action. In traditional animation such a thing would be hard to maintain across a long period of time.
You get the creative freedom of making anything you want with stop motion as a puppet to manipulate and move around. This is something that may be hard to do in live action animation.
Stop motion is very cheap and cost effective. A puppet can be made out of cheap clay and reused for hour of repositioning and picture taking. In traditional animation you would have to draw a new frame every time. And that would take a way longer time than stop motion. Live action would be expensive as well and you would have to pay people to do the posing and acting for you.
So in his animations Jiri Trnka used video of a movement along with stop motion as well as pixilation.