They "remade" just enough to be able to defend if the Gamebryo creators came after them in court.
The fact the creators of Gamebryo went bankrupt and the new owners are a bunch of bankruptcy suits who wouldn't know code if you typed it in front of their faces helped plenty I'm sure.
This "new" engine is barely any better than the "old" one.
And has all the same nice little quirks, like the ridiculously bad physics for one example.
Instead of licensing a real engine made for the 21st century, they chose to keep polishing a turd in the hope a diamond would pop out ( and save themselves a license fee ).
Lol what? This updated engine is a lot better than before, especially in terms of graphical performance. The physics have nothing to do with the Creation/Gamebryo engine either, it's middleware (Havok Physics) and the fact that it's so bad is to blame on the default settings and/or the weight settings in the model NIF files. Besides, the physics
have improved, where you would run straight ahead into the air when you would run down a stair in Oblivion, the character now keeps attached to the ground realistically.
Despite it's faults, there are also a lot of awesome features in this engine that are perfect for creating and modding an immersive open world game. But hey, the grass is always greener on the other side eh.