I can understand very well where the fear and discomfort comes from about early gunpowder weapons as fantasy games, silly movies (if they ever used any pre-flintlock or matchlock weapon anyway) and the problems with modern firearms shakes people ‘romantic’ view have about fantasy but also medieval ages. In games they keep firing gunpowder weapons in ridiculous belt-fed speeds and eve if they could reload them magically in a second the powder would go off right away by the loading process as the gun would be simply too hot.
But you have to keep in mind that way before the inventions of the weapons mentioned above that powder weapons were extremely dangerous but with time cheaper to produce and people easier to train then some archer with a longbow which reacts like a modern firearm in a controlled way so that a skillful archer can replicate a good single shot much better than anyone could with one of those early brute, crude ‘hand cannons’ .
The other big fear comes from other players using their knowledge of science and modern weapons on such early powder weapons and rampaging with them through the game. But I think this fear can be easily countered by remembering that those weapons had no standardized ammunition and production standards.
Players which try to use gunpowder weapons without any skill for it would have a very high risk to injure themselves with every try and/or maybe even start a fire in the process.
IF they would put points into that skill then that would not help them much either as those weapons were almost exclusively used just in sieges and battle fields because they were damn heavy and cumbersome and powder supply would be VERY difficult outside any army and the danger for the powder going bad through rain and storage reduces that risk significantly.
If some players would really create several characters with their hands maimed by exploding fire arms they might try to find something else to waste their time with.
So besides the known issues with those contraptions I think the biggest problem some have is the romanticized look they have of fantasy and medieval game worlds and any gun no matter how primitive is seen as an immersion breaker. Frankly, I have the same issue with those stupid Gnomes in most fantasy games with their gadget obsession for mechanical devices as they remind me of modern day age and the smart phone and i-pottie craze which I would like to forget when playing a fantasy game. But luckily the world is large enough and they are rare enough to avoid them.
And if I ran into one anyway I just ignored my feelings about them as they are part of the world I like to play in and treated them like anybody else. So if I have to choose between historic accuracy and personal preference then I prefer accuracy and I have the strong feeling that most history buffs tend to see it the same way.
Time will tell, it would not kill me if they are left out but it would feel wrong like chainmail bikinis and ‘perfect’ hairstyles for people on KC’s fields and villages.