Earlier quoted context omitted.
There's still humans in postal sorting centers? https://www.youtube.com/watch?v=zjdpz05u2DY omg...
Basically has to be right? Even if the shipping labels were completely standardized, you still have to deal with irregular package dimensions, composition, and label locations. The sort of stuff that robots aren't so good at.
But intl shipping is based strictly on weight, so senders have every incentive to cut weight wherever possible.