Substance

Design need to have substance. 

Design as a result of copying design from others have no substance. And here is why.

Substance comes from design method (a way of designing) that gives relation to one who experience it and its subject that a design is informing. Meaning, reality, philosophical truth that a design wants you to experience. 

By replicating design, only appearance is usually copied, method and underlying procedure is not copied. 

Even if you can copy way of designing, the one who do it is different. 

You can print two toys that look exactly the same in a factory. But the manufacturing time stamped on each toy is still different. 

If you managed to print both toys at a same time, their coordinate and positions of point in space is still different.