Originally, a main reason for cargo ships to abandon sails was more efficient dock logistics. Construction of cargo sail did not stop until well after the more

Originally, a main reason for cargo ships to abandon sails was more efficient dock logistics. Construction of cargo sail did not stop until well after the more speed sensitive military and passenger applications had converted to steam engines, even to steam turbines. Late cargo sail like the giant American schooners got by with surprisingly small crews (though it could be argued that they were too thinly crewed for reliable operation). Modern concepts like https://skysails.info/ https://skysails.info/ hardly interfere with deck access at all.