Maybe "an interface to a traditional world sim with more window dressing", is all you need? Especially if the traditional world sim is fairly rich itself (not

Maybe "an interface to a traditional world sim with more window dressing", is all you need? Especially if the traditional world sim is fairly rich itself (not like, as rich as the most rich that had been made before, but still decent), and the way the GPT part connects to it is good enough.