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The long-haul leg of a shipment is the reliable part. Almost all delivery failure happens in the final few miles, and it is also where the customer forms their entire opinion of whether you are good to buy from.
The last leg is many small movements to many different places, each with its own access problem, opening hours and person who has to be there. Everything upstream was one large movement between two facilities that expected it.
It costs the redelivery and it costs the relationship. For a wholesale delivery it can also mean a missed receiving appointment, which at a large retailer is a chargeable event with a published fee.
Information rather than speed. Most failures are somebody not being there, and most of those are preventable with an accurate window and a way to change it.
The receipt, recorded by the party receiving the goods, and the events around it. A delivery is counted when somebody on the other end confirms it rather than when the carrier closes its own loop.