The Witness is a 3d engine made from scratch. Not all AAA companies use Unreal or Unity.
Having a 3D engine does not a AAA make. The Witness is a beautiful looking game, but the amount of state and interactions it has to deal with is orders of magnitude less than GTA: San Andreas. It is closer to the complexity a Myst remake would have.
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Having a 3D engine does not a AAA make. The Witness is a beautiful looking game, but the amount of state and interactions it has to deal with is orders of magnitude less than GTA: San Andreas. It is closer to the complexity a Myst remake would have.