Data transformations are a small subset of business logic. Talking to microservices, third party integrations, and email, for example, are other pieces.
Right, you'd use your API backend and tie them into Hasura with actions if you wanted them tied to Hasura. Of course you can't have your whole app in Hasura, and I don't think they make that claim? Maybe they did before they added actions, but I think they knew that a bit bogus so they added actions and before that had remote schemas.
