I agree on the fact that you may have edge cases cropping up in production... still, in my experience this approach makes adjusting (either by introducing new S

I agree on the fact that you may have edge cases cropping up in production... still, in my experience this approach makes adjusting (either by introducing new States, or by altering the logic that guides a State Transition) much easier because you can reason about the problem in terms of a specific item and a specific State Transition at the time, even if this happens to 10k records at the same time, and there are another 10M records of different type and in different states. I used a SM no more than six months ago to process vouchers and voucher redemption from a third party service and while we had no less than 10 changes after deploying in prod... each one was easy to analyze and the actual fix was like 2-3 lines of code.