Even though the rumour originally was that they'd create a new engine for Starfield and Elder Scrolls VI, Bethesda have opted to stick with the same software they've been using, well, since Morrowind. Creation is also the Fallout 76 engine, and that's not necessarily an optimistic statement, considering.
It allows us to create worlds really fast and the modders know it really well," says Bethesda's Todd Howard for Gamestar. "That lets us be efficient and we think it works best." Whether it's worth the jank, though, is up for us to decide as end consumers.
More here: https://www.gamewatcher.com/news/starfield-elder-scrolls-6-engine#
yikes.
Downgrade me if old.