Creation is tailored specifically for Bethesda games. It’s a branch of GameBryo. People want them to stop using Creation because of how janky and buggy thier games are. The idea being if they used a better engine the games would be better.

Personally I think it’s Todd Howard and Pete Hines that are the causes of the stale janky games. But the engine (again, the only platform they’ve ever worked with) does not help.

Epic also doesn’t claim Unreal is a completely brand new engine when it releases a new version update.