A previous dev has suggested the GTA six map need to be smaller sized and a lot more densely packed. Nevertheless, as leaks have ongoing to trickle away from Rockstar, modders have recreated the GTA six map in GTA five's engine which provides a way of its huge scale. https://gta-six-logo42974.bloguerosa.com/34329267/everything-about-grand-theft-auto-6-trailer