So whats the problem? As Big Data science increases our ability to model or simulate complex systems, these models, ironically, become as complex as the real world. But they are not the real world. Whether its astrophysics or the economy, building a computer model still demands leaving some aspects of the problem out. More importantly, the very act of bringing the equations over to digital form means you have changed them in subtle ways and that means you are solving a slightly different problem than the real-world version.