Yes, I know the last game is open-world with multiple medium-sized maps rather than 1 huge one, but I was replaying 2033 and was just thinking: how cool would it be to maybe still have some overarching quest (get to polis or whatnot) BUT be able to freely travel to whatever stations you wished. To be able to explore more of the world and see different stations/meet different people. You could still have all the stealth and high-intensity combat and whatnot, but just be able to go off the beaten path and say "I've never been to X station, let's go there!" And be able to risk taking shortcuts above-ground to get to different places.