10 points
A ton of things that come by sea doesn’t matter much on time. Think about steel and vehicles and raw goods and all the other stuff that isn’t direct to consumer. A month or so isn’t a big deal in many cases.
The problem is that if my math checks out and what is written in the article is true, then this sail boats capacity is less than 1/4 of a single percent of the bigger fuel powered ships. You’d have to make and sail another 500 just to equal the capacity of 1 normal cargo ship.