I'm not sure your explanation is correct. The quant bots are also decision systems who attempt to predict in non-deterministic environments. The reason they go

I'm not sure your explanation is correct. The quant bots are also decision systems who attempt to predict in non-deterministic environments. The reason they got replaced isn't because the problem became deterministic (like a calculator). It's because the error rate and the cost got to an acceptable place when compared with the cost of a human quant.