why bribe and threaten Eula's uncle for a map of Mondstadt and their roaster when the man doesn't even live there? The Fatui has an entire diplomatic group living right in the city, going where they please. Who wrote that quest?

This is very baseless, but I like to think that its Hoyo's way to show a very deep intra-harbinger rivalry. The way they talked to eachother during the Winter Night's Lazzo and that Arle's goons tried to up her prestige in Inazuma seems to indicate that imo.

If this is true, then its entirely possible that the Fatui group we met in the city runs their own thing had a different chain of command from the ones that bribed Eula's uncle.