Cargo ships could use wind sure, it would just be much slower and each boat would have to carry far less stuff.

Might solve problems for countries that have lost their own manufacturing capacity because shipping products gets way less appealing.

It's not just that wind is unreliable, it's also very low energy density. You'd need a lot of sails to haul a small amount of cargo. There are applications using kite sails to supplement combustion engines, but that's just an opportunistic mitigation.

Several designs have been proposed for adding sails, of one shape or another, to ships in addition to an active mode of propulsion in order to reduce fuel consumption.

Further, the ships take a significant amount of energy to get going, so much of that initial acceleration could be handled by strong tug boats which would then be immediately recharged.