As the article says at the end, a key technology here is automation. Lots of cargo isn't time sensitive, but paying a load of crew to take shifts sailing it sl

As the article says at the end, a key technology here is automation. Lots of cargo isn't time sensitive, but paying a load of crew to take shifts sailing it slowly over the Pacific will kill the economic viability. Additionally, making it unmanned gets rid of a lot of the safety concerns, especially if you're going to use hydrogen and run them primarily over water. Still, hard to see the advantages compared to container ships.