Again, there's a difference between what's technically possible and what's likely to happen, or accomplished most easily - or else we'd have that global supergrid of solar panels with everything electrified already.

In the particular case of the Casale process, you can just look at how all the endothermic and exothermic reactions add up to see why we don't often make synthetic gas from electrolysing water and combining with atmospheric nitrogen.

Corn-based plastic isn't exactly widespread, either.

There's a difference between what's technically possible, or possible in theory on paper, and how things turn out in practice. Which is why we can't compare uranium with fossil fuels and renewables on a simple energy-out basis. There's a lot more to it all.