I’m confident there isn’t much, if any, GameBryo left in the creation engine. Sure, they may share some bugs, but that doesn’t mean much. They could be caused by things Bethesda introduced.

I do agree that UE has had a lot more development, and that’s the issue with the Creation Engine, like I said. They haven’t invested in it like they needed to. They’ve done the bare minimum to keep the renderer looking modern (though I’d argue Starfield totally failed, specifically with faces), but not updating the core engine. UE is a commercial product on its own though, and it’s designed to be a lot more versatile than CE. CE is meant to make Bethesda games and that’s it. CE shouldn’t ever be expected to compare to UE on everything.