If Bethesda were to use UE you can’t forget that they wouldn’t be using the Unreal Engine 5 of 2023, they’d be using (at least to begin with) the Unreal Engine

If Bethesda were to use UE you can’t forget that they wouldn’t be using the Unreal Engine 5 of 2023, they’d be using (at least to begin with) the Unreal Engine 4 of 2015 when they started developing it. Since a game like that is so big they’d be making a ton of changes to the engine itself that means that if they wanted new features they’d have to manually merge them in, which depending on the feature might not be worth it to them.