>Moving cameras can be pre-rendered.
>in theory it's possible to have the camera walk backwards, as well as creating a branching path the camera can follow, making it completely seamless
>only one or two games in history use pre-rendered cameras

Time Commando:

https://www.youtube.com/watch?v=acj1ewLSD9Y

>the pic uses a pre-rendered technique
>the entire background is a 2D image
>meaning they first need to make the 3D scene, then turn it into a 2D scene, and adjust until it feels seamless

This is literally lost technology at this point. Games like these used to run on PCs with no graphics cards.