Comment by shermanmccoy

Precisely! So picture some, however oversimplified, code which searches a customer's orders, determines which is a phone product id, remembering they sell other stuff which we would not want to update in flight order details on, then updates the embedded customer address on the order.

I would like to hear some original thoughts on why this is so difficult that a human is doing this work instead.

Obviously maintaining a different behaviour for a class of product ids is painful and not beautiful code to look at, but it is the real world.