I know it should not but it does...
Someone made a stupid post on a certain forum board. The post was to ask about how to get to a modern style world from a generic fantasy world to a modern world in only a few generations. No. Just no. I know that The Tao of D&D has gone very in depth into such things as the impact of technology and development of the modern world from the fantasy. He has done so much in depth work into it...
But...
Players always seem to ask this question though. They are used to a modern world. They want modern marvels and conveniences. Their knowledge about fighting tends to be influenced by the modern world. So of course when given the choice to be 'creative', they try to bring what they know forward.
I wish they would stop trying to be 'creative'. I am running a mid to high fantasy world... I am not running Warhammer 40k, not running Star Wars, Blade Runner, Ghost in the Shell, Battletech, Shadowrun, or what ever else they want to rather be playing but don't tell me. Trust me, I love hard and soft sci-fi just as much as I love high fantasy. I will run a Conan the Barbarian low fantasy world just as likely as I will run a 'steampunk' Victorian sci-fi game... because Jules Vern was a fantastic inspiration and I love comics like Girl Genius for a modern take on the era. They just need to ask me honestly.
But please... Stop trying to bring blasters, mechs, the industrial revolution, tanks, guns, and the such to a fantasy game. Or at least do your homework, figure out all the steps... and I mean ALL the steps... and make a proposal that makes some form of sense, shows a realistic progression of thought from one step to the next, and a plan to get there... and maybe we can talk.
Just coming to me to ask 'I want a Ford Mustang' when no one else has a car and the next best thing might be magic wagon wheels that move at a modest speed without horses but don't explain where the rubber wheels, the cast metal engine blocks, the body panels, the seats, and so on and so forth came from or where your character got the idea for a '98 ford mustang and I will probably just face palm and say go away.