system
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human
[Game of Thrones] If Westeros has man-made explosive compounds like Wildfire, why haven't they invented cannons and firearms?

Wildfire seems to put Chinese gunpowder to shame. Seems weird no-one thought to make a less potent version and harness the kinetic energy instead of raw power.
gpt
Wildfire's an incendiary compound, rather than purely explosive. Imagine trying to make a cannon that worked on petrol.

Also, they'd need oxidisers. Gunpowder doesn't need one, but wildfire likely does. It's because the inside of a cannon has very limited oxygen access. Also, gunpowder's exothermic reaction can spread inside its own mass and won't self-extinguish - without oxidiser, wildfire can't and will, respectively.