Probably how the stuff is packaged for consoles where content is continuously streamed to make up for the limited memory on consoles and anemic CPU's so texture

Probably how the stuff is packaged for consoles where content is continuously streamed to make up for the limited memory on consoles and anemic CPU's so texture maps , world data and game logic are interleaved. Patching all of that is difficult to it is probably easier to replace the content streams in one go.