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I like this framing. The code we usually start with when our software system is relatively simple probably has a pretty high degree of changeability. So, the work is to make sure we preserve so that it remains easy to change as the system grows in complexity.

To borrow from Sandi Metz's excellent book: "Design is the art of preserving changeability". My argument is that moving the logic into a domain object like Notification, which the Job simply calls, makes the code more changeable than dumping everything into the job itself.