If you ask me, a lot of the systems they built for open worlds like Elder Scrolls and Fallout make far less sense when you're an interplanetary space traveler, like waking up a person at your home base to give you a tour of your new club, because they're on a day/night schedule where they walk between their room and the living room. And it's not like open worlds or even Bethesda-esque RPGs haven't been built in Unreal before.