I'm sure you've seen at least one of those stories. They either are self-inserts where a person from our world finds themselves in Westeros and starts introducing things like gunpowder and other inventions. This either takes form of a possession (for example someone waking up as Joffrey) or a new person appearing from thin air. They are also stories where characters from other fandoms appear in Westeros and do the same. Most of these stories are pretty similar. The new character starts uplifting Westeros, adding gunpowder, better agricultural tech, steam engines and eventually even electricity. Of course, most of these stories, especially the self-inserts, are basically fix-it fics with barely any conflict. But can a story with such a premise be good? I'm not even talking about self-inserts, but simply an ASOIAF fic where someone begins introducing better technology. Perhaps an inventor who wasn't born in canon. I have yet to see such a story which doesn't make me quit after the first chapter.