If physical engineers understood everything then standards would not have changed in many decades. Safety factors would be mostly unnecessary. Clearly not the case.
If this was enough all novel creation would be engineering and that's clearly not true. Engineering attempts to discover & understand consistent outcomes when a myriad of variables are altered, and the boundaries where the variables exceed a model's predictive powers - then add buffer for the unknown. Manipulating prompts (and much of software development) attempts to control the model to limit the number of variables to obtain some form of useful abstraction. Physical engineering can't do this.
If physical engineers understood everything then standards would not have changed in many decades. Safety factors would be mostly unnecessary. Clearly not the case.