UE5 simulates physics and which physics are you referring to? I didn't see any interesting physics in the trailer that stood out. I think maybe their water simulation but, different teams will choose how they handle that. As to your claim that the quality would drop massively if they added everything in, that's actually juxtaposed to nanite. The whole point of Nanite is to counteract that so I'm not sure....
That's production quality which is something I never argued. Rockstar are best in class at keeping their worlds cohesive. As to claims about pop-in, I'll wait till the game releases to comment on that.
Wh, what physics am I referring to?
Hair physics that don't clip, muscle deformation, car physics with roll and sway, wind physics with also affect the water physics, destruction physics..
The point IS that the production is next gen quality... And you're already making a ton of claims off of a video, why are you stopping at pop-in? Use your eyes and judge the video as it is. What open world game has less pop-in? I'll wait.