A little addendum to this post (from a year and a half ago) is that while people like to point out that firearms predate things like plate armour and rapiers, I think that sets up a bit of a false expectation… (cont’d).
I really dislike the prevalence of crossbows, particularly one-handed ones, in fantasy as a stand-in for guns. If you want guns in your fantasy setting, just have guns. It’s allowed.