I have an issue with how it works. Let's see typical situation: alice is buying something from bob on amazon. The client interface takes care of sending escrow_transfer_operation with amazon as agent when the purchase is made, proper fee is deduced from payment's total, server automatically approves the escrow from agent side. In most cases some bot will also approve it in the name of bob, only in selected cases bob might need to manually approve it (f.e. alice wanted her initials embroidered on the skirt she is buying, which requires some back and forth messaging to iron out the details first).

So far so good. bob sends the purchased item to alice, registers package tracking info with Amazon so they can see if the package arrived. But once the item is in hands of alice, it is pretty much all from her standpoint. She might have a problem, f.e. it was supposed to be a salmon skirt, but she got coral one, in which case she might contact bob and get a discount (bob releases some funds back to alice), but in most cases, when everything is ok, she has no incentive to release funds to bob. It is unnatural even to expect her to do anything. So bob is left with one choice only: to open dispute and wait for amazon to give him the funds. And he has to fit within escrow_expiration, because if he does not, alice could snatch back the payment before he does. But that's not the intent of opening dispute. The transfer should automatically complete by sending remaining funds to bob when there was no dispute prior to expiration.