There are a few reasons why this could be chosen over something like Airflow. They are (but not limited to): modern workflow semantics including both functional and imperative API and the ability to work with dynamically mapped tasks, a stricter / richer notion of state, data passage between tasks as a first class operation, better scheduling semantics (workflows aren’t required to have a schedule, scheduled flows can still be run off schedule, and it’s possible to have multiple runs of the same flow occurring at the exact same time), etc…