[jxy]

As computers and networks evolve and improve, a lot more things would get involved and it is going to be hard to tell how long any operation is going to take. Operating on an assumption of always instant feed back does not scale.

Ordering a sandwich in a restaurant apparently becomes less normal nowadays. Instead we order it online for delivery. I would find it extremely annoying if the delivery service keeps sending me messages about his status. If the delivery is going to arrive at the time frame I asked for, I don't want any extra information from them. While I wait for the sandwich delivery, I can order other stuff too. I only want any messages about anything I ordered is if the delivery is not going to make it. If I received such delivery error, I can submit another order from a different delivery service.

Now you can go down a level and consider how the restaurant operates in this case. The restaurant receives orders from a queue and make those in batches. Whenever the delivery person comes, the restaurant hands out packaged orders each with their endpoint addresses. The restaurant does not need any extra information from you or the delivery person, unless something unexpected happens. There is no need for extra communication unless there is an interruption.

If you are the restaurant owner, of course you need to manage ordering ingredients for the restaurant, and ordering sandwiches for yourself. Whatever you need to order, your system can be transparent to it. Once you make the decision what to order, you can go back to paragraph two above and start from there.