IronWolf
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This puts Golarion, perhaps, on the cusp of entering a new age where firearms could become much more widespread... or perhaps at the cusp of an age where firearms wither out and fade into obscurity as they're overshadowed by magic. By presenting firearms in this manner, we basically enable GMs with the ability to take either direction in their own games, since we know that not everyone wants firearms to be commonplace in their games.
This is excellent! While I generally have no issues with trumping something in a campaign setting if I feel it doesn't fit, this makes it even easier for one to do so logically. Looking forward to the new campaign setting book.