aoen commented on issue #4904: [AIRFLOW-4070] AirflowException -> log.warning for duplicate task dependencies URL: https://github.com/apache/airflow/pull/4904#issuecomment-472127972 I agree that I don't see any risks to this (no need to throw breaking exceptions on no-op). I think maybe the purpose of this could have been immutability, but I don't think there's too much value in the current state, and also without good constructs for copying DAGs it leaves gaps. e.g. to make composable "subdags" (different concept from the SubdagOperator), we need some way of copying the tasks from one DAG to another which is not currently feasible.
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