> Solar is going to be a very transformative power source for developing nations. Because it can be bought in small quantities.

100% Agree

>While it's less attractive for developed nations because it's still more expensive than fission and coal.

100% wrong. This hasn't been true for a while now. Today solar and wind are often cheaper than even running a fully paid for Coal or nuclear plant.

https://cleantechnica.com/2022/07/21/most-renewables-cheaper-than-cheapest-coal-in-g20/