A previous dev has prompt that the GTA 6 map needs to be scaled-down and even more densely packed. Even so, as leaks have ongoing to trickle outside of Rockstar, modders have recreated the GTA six map in GTA five's engine which provides a sense of its large scale. https://gtasix20742.ampedpages.com/everything-about-grand-theft-auto-6-website-62310265