To be honest. I like the at least once constraint. It causes you to think of background jobs in a idempotent way and makes for better designs. So ultimately I never found the removal of it a mitzva.
Also if you don't have the constraint and say it works and you need to change systems for any reason, now you gotta rewrite your workers.
Also if you don't have the constraint and say it works and you need to change systems for any reason, now you gotta rewrite your workers.