There are still some smaller commercial cargo sailing ships, it’s somewhat ambiguous when the last major sailing ship stopped but 1949 is one reasonable date.
The less obvious issue is simply manpower and difficulty loading intermodal containers.
The less obvious issue is simply manpower and difficulty loading intermodal containers.
I'm no sailor though. Just seems like we have more ability to finely control/automate stuff in ways that weren't available in 1949.
Now these aren’t insurmountable issues on their own, but wind as supplemental power via kites or something seems like a far more viable option.