[dscpls]

There's no question sails can move today's cargo volume. But the shape of the ships doesn't lend itself to sail power. I think these sails are specific to supporting other power. And the shape of today's ships is very much towards fitting more cargo. I think you'd need at least slightly bigger ships that are efficient for sail power alone, and able to carry similar cargo volume or mass.

[dzhiurgis]

I think such rotating sails could be almost called 'solid state' - basically zero hassle compared to a traditional canvas where there is always person on lookout, trim before wind picked up, make sure rigging is maintained, etc. That said these probably produce way less power.

[jhayward]

Rotating sails and wind turbines have historically been extremely high maintenance due to the forces the long moment arm puts on the rotational coupling at the base.