Unreal isn’t by itself capable of the systems that allow Starfield to work the way it does, and would require serious modifications to do so
Can you back that up? Nothing I’ve seen of Starfield indicates it couldn’t be done in UE.
Please check out Angels Fall First and Renegade X, they’re made with Unreal Engine 3 and are not AAA titles, so they can give you a glimpse of what even older versions of UE can do.