The SKs have the equivalent of nuclear weapons in the context of potential for ecological destruction.
It would be a trivial matter for an SK to turn up at the fields surrounding a rival’s city and start razing/defiling those fields through epic psionic enchantments. That would render the population of the city without an agricultural base. Of course, the victimized SK could do the same in revenge.
This is a tactic that can’t be deployed unless the other SK is dead. Obviously, it’s rare.
I think that the 3.5 Dragonlance supplement Legends of the Twins should be the model on which we present the Dark Sun setting. Don’t like Rajaat and the halfings? Fine - something else happened in Athas’ hidden history. Think Kalak is a cool guy and wouldn’t have allowed himself to get killed? No problem. The problems in Raam finally boiled over and now Raam is known as the Free City of Raam. Think that Dregoth’s plan to be a god on Athas is lame, and that Dregoth would know better? No problem - Dregoth is planning to move his chosen people, the dray, to another prime material plane world beyond the gray, but not before he gets revenge on his enemies.
The Prism Pentad, which I enjoyed, railroaded people into a scenario which is largely at odds with the mystery of the original Dark Sun boxed set. We can do better.