Photosynthesis is at least an order of magnitude less efficient than photovoltaics in converting light into chemical energy.

It is also many orders of magnitude easier to fill large spaces with photosynthesizing devices which will convert CO2 from the atmosphere into usable material. Including foody building materials, fuels.

I think he's talking about creating food and oxygen to breath, not chemical energy.

That is also chemical energy! And we make more than enough food already right?

perhaps enough food. But it's very poorly distributed

for the amount of stuff people buy on temu and shien, no