I think you misunderstood the parent post. Wolf3D was not really 3D, nor was Doom after it, and many other FPSs that came around at that time. Quake was the first really 3D FPS (e.g. you could walk under a bridge without "tricks").
I don't know what development process they had at ID at the time, but given that it was a Carmack project, I very much doubt it was anything like "any other" software project.
I don't know what development process they had at ID at the time, but given that it was a Carmack project, I very much doubt it was anything like "any other" software project.