I've got no objection at all to gunpowder or firearms in a fantasy setting.
As has been frequently pointed out in the thread, they are not automatically common across the whole world from the moment of their invention and they do have both advantages and disadvantages that mitigate both their use and them being ignored in favour of other weapons - including magic.
I think, though, if you're going to introduce realistic advantages and disadvantages of firearms, you'd have to do it for all weapons - which is something I don't particularly have an issue with.
If you can't realistically model the advantages and disadvantages of other weapons, then arbitrary restrictions/attempts at realism with firearms would not work.
As has been frequently pointed out in the thread, they are not automatically common across the whole world from the moment of their invention and they do have both advantages and disadvantages that mitigate both their use and them being ignored in favour of other weapons - including magic.
I think, though, if you're going to introduce realistic advantages and disadvantages of firearms, you'd have to do it for all weapons - which is something I don't particularly have an issue with.
If you can't realistically model the advantages and disadvantages of other weapons, then arbitrary restrictions/attempts at realism with firearms would not work.