Reminds me of the eternal sage of the Duke Nukem follow up.
First their own 3D engine - then a version of the Doom engine which they needed to "improve" - then Unreal - then by the time the game was close to done Unreal shipped a major upgrade which they needed to "upgrade" to.
First their own 3D engine - then a version of the Doom engine which they needed to "improve" - then Unreal - then by the time the game was close to done Unreal shipped a major upgrade which they needed to "upgrade" to.