I worked with maritime shipping folks, and they always say "We don't care how slow it is, but we care A LOT to estimate the time it takes right".
The logistical chain is long, so delaying one link breaks the whole chain, and that's costly.
The logistical chain is long, so delaying one link breaks the whole chain, and that's costly.
Same thing with train carts that arrive to pick up the containers -- there's little place to park them to wait.