My point is that tons of people have wanted to do this and tried and failed. There is too much to model and existing models don't have predictive power. Basically when calibrating the models there will multiple sets of parameters that fit past data and produce wildly different predictions. If you could devise a general macroeconomic model that made accurate predictions you could become ludicrously wealthy. Even accurately predicting corn prices 5 years out would net you considerable returns.

So many things that effect economic behavior just aren't really quantifiable. Even Keynes who was a proponent of modeling and economic planning acknowledged this[1]. Hayek talked about information being too decentralized and preferences arising organically, which made planning(modeling) imprecise and inefficient if not impossible[2].

[1] https://en.wikipedia.org/wiki/Animal_spirits_(Keynes)

[2] https://www.kysq.org/docs/Hayek_45.pdf