We've done something similar for our medical device; totally deterministic simulations that cover all sorts of real world scenarios and help us improve our prod

We've done something similar for our medical device; totally deterministic simulations that cover all sorts of real world scenarios and help us improve our product. When you have determinism, you can make changes and just rerun the whole thing to make sure you actually addressed the problems you found. Another nice side effect is that if you hang on to the specification for the simulation, you only have to hang on to core metrics from the simulation, since the entire program state can be reproduced in a debugger by just using the same specification on the same code version.