Comment by schobi

Same understanding: On the receiver side, we are going to drop duplicates (by processing, or by having no effect on the grass cutting any more). Thus, the end user is then seeing only one effect, one message delivered. The effect of delivery "message received" or "grass is cut" is achieved.

But still, the sender might need to send more than once (until confirmation). From the cost at the sender "sending multiple packages" or "sending more grass cutters" this is still the scenario "send one or more".

Sorry to fuel the fire... it is about the definition of "delivery"