What are you talking about?
Most of the cinematics are created in another tool for ease of use, then ported to the desired engine for upscaling and post processing.
Everyone has been doing something like that since PS2 era.
In terms of movies, it doesn’t make sense to render the movie in a render farm, then do it all over again in a game engine. That’s just doing double work.
Also, since game engines shows it can be done, Autodesk’s programmers are working hard to get the same result in their platforms.