I had a realization that the very existence of private domestic shippers in countries indicates a failure of their government to provide universal infrastructure needed by all citizens.
There may be specialized needs like same-day couriers, special handling requirements and other edge cases, but those should be small specialty houses, not international mega-corps.
The international shipper’s logistics would have to be theirs to handle, just as they are today. Any inefficiencies would be passed on to the consumer, as always, and more efficient shippers with better logistics can win on price with their lower overhead.