This is a false dichotomy though. The proposed approach here has a (theoretically) great cost to value ratio. Spending time on a workload generation process, an

This is a false dichotomy though. The proposed approach here has a (theoretically) great cost to value ratio. Spending time on a workload generation process, and adding some asserts to your code is much lower cost than hand-writing tens of thousands of test cases. So it's not that this approach is only useful for critical applications, it's that it's low-cost enough to potentially speed up "regular" business application testing.