At 33:17 Ryan Brucks talks about Grid-based editing, a new tool that partitions the world into a grid. He says Grid-based editing will ensure actors get placed into the right sub level. The tool isn’t released yet, but he does go on to say that you can achieve similar results with the world composition tool and it’s tiled import feature to help create a grid.
What you say makes a lot of sense. It’s with him talking about grids,sublevels, and world composition that led me to infer that world composition had been what they had previously used. Perhaps you are right though, maybe he is just saying that ‘if’ you wanted that grid based functionality and sublevels like they ‘currently’ use then world composition would give you that, but neglects to point out the can of worms opened by doing so.
It would be good to read your interpretation of what he said if you’re willing to have a peep at that part of the video.