A former dev has advised the GTA six map need to be smaller sized and even more densely packed. Having said that, as leaks have ongoing to trickle from Rockstar, modders have recreated the GTA 6 map in GTA 5's engine which gives a way of its large scale. https://gta-six-trailer-song31964.topbloghub.com/41741455/an-unbiased-view-of-grand-theft-auto-6-wallpaper