Some stuff in the game that was never mentioned in Howard’s works by that name. It’s possible that the stuff used by Natohk to blow up Khorajan knights in The Black Colossus served as its inspiration.
My point is, even though some individual geniuses may have had developed explosive materials, no culture developed it to such an extent as we’d see it used anywhere. No firearms, no artillery, no fireworks.
The stories were written in the same format as old west tales he heard from old cattle ranchers. That was literally the inspiration. Tales told in no particular order. It wasn’t a failure, it was an omission done on purpose.
I guess he also didn’t expect people to read his stories a hundred years later. Had he known he was going to create such an everlasting pillar of fantasy literature, he might have made some kind of a timeline - but he just wrote what he could sell, in an order that popped into his mind.
Considering how the Conan stories were written in such a haphazard order, and sometimes several stories at the same time, it’s impressive how there are really no noticeable continuity errors that would feel like “this makes no sense, because in another story there was something that contradicts that”. They’re all stories of events that happened to the same guy who would eventually become king, and somehow, despite no overarching plot or plan for getting the main character there, he manages to be a thief, a pirate, a mercenary, a general, a tribal chief, a pirate again, an army scout, etc. before reaching the throne. Yet they all feel like they’re stories about the same person, and they all fit the image of the guy who first rested his chin upon his fist in Phoenix on the Sword.