Fans of RPGs know games from this genre typically come in two basic flavors: future, and past. More often than not, an RPG developer will stick to the obligatory fantastical medieval flavor when designing a game, because hey, why not draw upon a rich history, even if it's been done to death? Skyrim, Kingdoms of Amalur, and Diablo III might have vastly different worlds, but they're still rooted in the familiar terms of swords and skeletons.
And though a futuristic setting can remove the overused fantasy tropes, RPGs of this variety usually drop you into the dreariness of blasted wasteland hellscapes or cybernetic dystopias. It might be safer for publishers to rely on familiar settings, but RPGs are capable of doing so much more.