maybe a more illustrative example of where this can be messy is where a customer has placed an order for a bundle of products A B and C, and there's no "order b

maybe a more illustrative example of where this can be messy is where a customer has placed an order for a bundle of products A B and C, and there's no "order bundle" API that can do that operation atomically, instead the client code trying to place the order has to call a bunch of random stateful create-product APIs to attempt to construct each product in the bundle, and deal with the mess if suddenly some bundle items error while others succeed. bonus points if some of the create-product APIs are not idempotent. "congratulations, we've provisioned the bundle A, C, C, C that you ordered! sorry about B!"