The benefit of photosynthesis in this article is storing the electricity from solar radiation into a sugar, or hydrogen. Instead of converting the radiation to electricity, and then storing the power in a battery, or as kinetic energy through a spinning mass, or potential energy by pushing water up a hill.
The good news? we know this can be done. we can see the results of photosynthesis every day, everywhere. So this is biomimicry. Simple in the sense that we have a working model to build from.
Difficult in that we're trying to copy in a few months, what nature's had millenia to perfect.
But the chemistry will work for saints and sinners alike.
It is one of the key elements that give me hope.